I very much hope that WoTC will publish a 3.0/3.5 master index for all their works. It's the least they could do for publishing so many texts without indexes. It would also be a nice parting gift to those of use who own most of these works printed on dead trees.
It's be nice, but I can't see it happening. It would take forever to do and I doubt they'd want to dedicate the resources to it. I'd settle for them updating the cosolidated lists.