Ath'kethin
Elder Thing
3.5 was planned before 3.0 was even released. Monte Cook wrote about it back in 2003, and the story was carried on these very boards.given how quick 3.5 appeared.
I can't find his article now (the website on which it was posted seems to be defunct), but here's a bit that was quoted on ENworld a few years back:
See, I'm going to let you in on a little secret, which might make you mad: 3.5 was planned from the beginning.
Even before 3.0 went to the printer, the business team overseeing D&D was talking about 3.5. Not surprisingly, most of the designers -- particularly the actual 3.0 team (Jonathan Tweet, Skip Williams, and I) thought this was a poor idea. Also not surprisingly, our concerns were not enough to affect the plan. The idea, they assured us, was to make a revised edition that was nothing but a cleanup of any errata that might have been found after the book's release, a clarification of issues that seemed to confuse large numbers of players, and, most likely, all new art. It was slated to come out in 2004 or 2005, to give a boost to sales at a point where -- judging historically from the sales trends of previous editions -- they probably would be slumping a bit. It wasn't to replace everyone's books, and it wouldn't raise any compatibility or conversion issues.
That doesn't invalidate your point(s), but it does change some of the underlying assumptions.