Steve Jackson Games faced this when it became apparent that Ogre Designer's Edition would be later than they expected. But the attitude of most people on their forum is, "It's only late until it ships, but it sucks forever." Meaning they'd rather get the right game late than a bad game on time.
A particularly infamous example occured with the Exalted boxset supplement "Dreams of the First Age". Massively hyped up, but continuously receieved setback as production ran into numerous problems, delayed a total of 5 months after being pushed back 6 times, sometimes only a day or two before its supposed release. The increasing irritation at the delays—exacerbated by the product's high cost and sharply limited availability—caused something of an explosion in the fanbase.
The current writing team tend to play a bit fast and loose with release dates in the name of quality. Most notably, Third Edition - originally scheduled for December 2012 - is not yet released.
The team off-record admitted they gave that estimate, knowing damn well they couldn't meet it due to company policy. Other things occurred, such as the exit of Plague of Hats from the team due to creative differences, John Morke getting very seriously ill, school and work obligations and a complete redesign of the entirety of solar Charms among other, unknown details. While yes, it might be irritating and disheartening, the team has been very frank as to what's been happening with the game to the point of giving weekly updates on what's been going on in the OPP forum and (usually) monthly updates, including sneakpeeks at various elements of the system.