This is probably true, and a fundamental aspect of why I won't be going on to 4E. A lot of the stuff in the last 2 years has been interesting in its own way, and some of it is worth integrating, but taken as a whole the "4E warmup" period has seen, for me, the worst 3.5 changes and additions.
But, that is also means I don't much matter to WotC, and nor should I. i gave up on new WotC books (for the most part) a couple years back because the new stuff wasn't doing it for me. So, while I am a player, I am not much of a consumer, so my "vote" doesn't really count. 4E is going to be what it is going to be not because I didn't buy books, but because other people did -- enough people, it'd seem, to decide that some of the nascent elements appearing in the second round of the Complete books or the PHBII and the DMGII, not to mention Bo9S, get to be "core" now. There wasn't much I could do about it when it was being decided, and there's not much i can do about it now.
I guess the only thing that concerns me is how alone am I in this. If polls here are to be taken as anything resembling the general outlook of the potential consumer base -- I know, i know -- then upward of 25% of current customers will not be future customers. that's a pretty big hit. Where are the replacements coming from? I am really interested to see what kind of marketting blitz WotC enacts when release gets closer, because ads on website banners and blog posts aren't going to cut it-- you're just marketting to the people who already know, and have probably already decided.