I prefer vanilla to TBC, so obviously I would prefer a slower progression to keep the real vanilla for as long as possible. TBC is still better than retail though and I would continue to play here if Classic is still not released, but would very much appreciate a vanilla realm option when TBC is launched.
I also have the same problem. I got a 10 slot bag from the Wailing Caverns quest and it's gone after I logged back in. I also lost the 99-Year-Old-Port quest item after looting it not as big a deal since I can do the quest again but still a nuisance.