Come now, lets be reasonable. All your 3e books are not obsolete. Most 3e products are still usaeable. They may have to be tweaked some, but they certainly aren't obsolete.
I for one have few real problems with R3E (obviously, the term 3.5 is one ) and some things make me a bit leery, but on the whole, I believe R3E to be an improvement. And since it is largely backwards-compatible, none of the older books become obsolete (though there might be smaller or bigger conversion hassles in some cases).