Hasbro would have to be completely off of their rocker to introduce a new scale - odds are they won't cuz they wouldn't fit in the early bird display! Right?
But it didn't stop them from doing the same thing to GI Joe...
I mean the fans want something similar to VOTC - if Hasbro introduced a new scale, all of our ships, accessories and secondary characters would be completely obsolete.
Yeah, meaning that you'd have to buy all new ships and and accessories which they happen to also be making, just like GI Joe. Hasbro seems to think that if they did do a new scale, the fans would all start over - buying new X-Wings, new TIEs, new figures, etc etc etc.
While it may not seem likely right now, I wouldn't put it past Hasbro to try a new scale. They keep trying various ways to test a new scale (PotJ Mega Figures, RotS Force Battlers), I think it's only a matter of time that they try it for real, just like they are doing with GI Joe this year.
Of course, if the new scale GI Joe line flops horrible this fall (and it seems like it may becaue I know a LOT of Joe Collectors who are pissed about no more 3.75" figures) that could of course change everything.