I think there's something to be said for both points of view, but what I expect to see is a "Star Trek" style reimagining of Dragonlance that preserves the essential feel of Chronicles and perhaps Legends while erasing or at least blurring most aspects of canon. Such a revamp would surely provoke a visceral reaction from those who are strongly vested in past versions of the setting as well as those who think the MWP material should remain inviolate, just as anti-movie Trekkies/ers recoiled at violations of previously established canon and saw the various eras in which one could adventure (and their accompanying "Treklore") as enrichments to the setting rather than barriers to entry. But the bottom line is that the Star Trek revamp successfully reinvigorated the cash cow, and the hope will be that a well-executed revamp could do the same for Ansalon.
First of all, it remains to be seen whether Star Trek has in fact been reinvigorated, beyond the immediate revenue from the movie. When they launch a successful new Star Trek series, one which substantially outperforms Enterprise and Voyager, then I'll agree there has been reinvigoration going on. Until then, it is very much up in the air whether the reboot was a good idea or not. (I think it was, but my opinions may not be representative.)
Second, to be very blunt, the Star Trek fan community is vastly bigger than the Dragonlance fan community, and Star Trek has a much higher profile in the public consciousness. It also had a big-budget movie to pull in fresh blood. These things give Star Trek a lot more leeway to risk fracturing its existing fan base.
Third, because an RPG setting does not require a new story, Dragonlance has an option which Star Trek didn't: Put the new setting at a particular point in the franchise's history (my money would be on the start of Chronicles, the start of Legends, or the end of Legends), reissue the original series in a 25th Anniversary Edition, and quietly disregard everything that came after. There's no need to alienate a chunk of the fanbase with an "official" reboot. Those who like the post-Chaos War material can regard it as the "official" future of the setting. Those who don't can pretend it never happened. Everybody's happy.
For new novels, they can just keep doing what they've been doing more and more of - filling in the gaps in the setting's past. I'm sure there are at least twenty-nine minutes of Raistlin's life that haven't yet been made into a novel.