Well, that's the point really - v2.0 could be done in like a month and serve as a kind of workprint while at the same time it would be a full-fledged release to replace v1.0 - getting it to the same level of despecialization as SW v2.5 will probably take much longer.
And it wouldn't really slow me down at all, except for the time it takes to render the AVCHD (v2.0 would in this case probably only be an AVCHD) because everything I would be doing, I'd have to do for a full blown v2.5 version anyway.