I feel like if he were to get another power-up, it'd be a new form with a different visual for hype and marketing.
Have him attain a new power and use it through his Mystic form might make sense but it's not as cool.
People have come up with concepts like "Mystic 2" and the like that have no rationalization behind what they actually are.
Imagine if they actually have Goku be the next to be taken out, and that for this arc he's a Decoy Protagonist. I could see it that Goku and Jiren end up having a double knock-out and Gohan becomes the new focus
edited 21st Sep '17 4:25:04 PM by RJ-19-CLOVIS-93
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That'd kill a lot of the hype for his new form.
I mean, in terms of Popularity Power yea. We all know Super runs on that, so it's not an unfounded outcome.
I think it might be interesting if U7 doesn't win at all. Not because the main characters always winning is boring necessarily, but moreso because, since 7 can't be erased without ending the show, that means there's almost certainly an escape hatch that could not only save them but restore the others as well. Leaving them destroyed would be far too bleak for this franchise.

I dunno, I don't expect any of the "major" characters from Universe 6 or 7 to be bumped off until Jiren goes on his expected rampage and cleans house.
... You know wouldn't it be funny if Goku goes into his "Limit Break" form, only for Jiren to lay him out in one punch? Then we spend the rest of the tourney with Goku unconscious while everyone else tries the heck to survive?