The Network didn't go away.
- Gary, Andy and Steven convinced the Network that humanity was irredeemably barbaric: they'll continue to interfere, this time to prevent humanity from ever achieving any level of technology again and posing a threat to them elsewhere in the galaxy.
- It was only with the help of the Network that Earth reached the information age at all, and even then, it was still the least civilized planet in the galaxy. It doesn't seem like we'd ever be a threat to anyone, and the Network is impenitently rational and logical - not likely to waste the effort containing a threat that barely exists.
The blank Oliver found someone to take care of him.
- Without his eyes he still seem to have an idea of what the space around him looks like, but his vision is still damaged enough that he occasionally bumps into things, so it's reasonable to assume he can't see colors or patterns. So someone else must have drawn the eyes on his football head (And while the eyes weren't well made they seemed like they were made by someone who liked him enough to not make them stupid). That would also explain how he went from being shouted at and harassed for being a blank, to being trusted and respected enough to work. Peter going back to his family and living a normal life could indicate that the easiest way to be accepted and be safe from blank-racists is to somehow belong to a human.
- Alternatively, for Peter, he still looked human and his natural personality is already pretty timid and nice. He was already very Blank-like in that sense (Andy even mentions that his wife might not have even noticed). For Oliver, it might be his disability (or whatever you want to call it) and his tendancies to bump into things - it makes him look harmless and so humans trust him because of that rather than actually respecting him in any sort of way.
The Network is run by Paul
- Gary even says he owes someone named Paul.
- Paul was Andy's cousin, whom he says was a casualty of the apocalypse.
Gary's new crawl will bring humanity to a new golden age.
- The first pub in the crawl is "The Rising Sun", which is certainly optimistic. Who knows what the other pubs' names are?
Gary gets killed in the last scene.
- He's hugely outnumbered, and his Blank friends have been shown to be rather squishy. Plus, he was suicidal previously, so picking a fight with a bar of toughs may be the enactment of his deathwish.
The Network was created by assistants to the Incubators
, or perhaps it was the other way around.
- What, you didn't think we'd let this get too far before we got another Madoka crossover, did you? Especially not with another alien race boosting Earthlings' status and lifestyle at the expense of enslaving and killing and some humans, then disposing of them like dead batteries.
Humanity will eventually recover and make their way to the galactic community on their own. And they're going to be pissed.
Odds are good that after the immediate setback shown in the epilogue, humanity will eventually be able to get communications back up and regain some of the technology lost when the Network left. With information given by survivors like Gary and Andy as well as any information the surviving Blanks can offer, humanity as a whole will soon know about the Network and what they've done.
This will likely take years, of course. And afterward humanity's focus will be on things like rebuilding society, gathering information, getting technology back on track, taking account of the dead, figuring out what to do with the Blanks, etc. But mankind will now know that there is intelligent life on other worlds. Intelligent life that is not only capable of causing us great harm, but already has. Intelligent life that manipulated and killed thousands in a very clumsy attempt to indoctrinate us. Intelligent life that knocked mankind back to the Dark Ages, resulting in even more deaths, as part of what amounts to a tantrum
I imagine that once things have stabilized, humanity is going to unite behind a second space race and pour most of their resources into developing space travel. This amount of support will see mankind's quick advancement into space exploration. Maybe even more quickly depending on whether or not the Network left behind any technology that could be reverse-engineered or if the Blanks have any useful information on their creators they can share.
It will probably take decades or even centuries, but eventually mankind will find its way to the Network and their galactic community, having become a force to be reckoned with on their own terms, even as a race of "fuck-ups". And they will remember what the Network did to them.
In short, congratulations Network! You did manage to get humanity to be a part of the Galactic Community!
Just not quite the way you intended.
- Bonus points for being effectively the malcontent bar brawlers of the galaxy-an entire race of pub crawlers. Oh, the poetic justice...
Everything after Gary drinks the leftover beer at The Famous Cock is a hallucination on his part.
- It's only after Gary sucks down five half-finished glasses outside The Famous Cock that things get really weird. Perhaps Gary simply got incredibly sick after this point and the rest of the film is all in his head.
- Maybe one of them was spiked.
The Network didn't destroy the world's technology out of spite. It simply left.
- It was the Network's mere presence that powered the whole world's digital technology all along. Leaving the planet essentially amounted to pulling the plug.