yep...the general negativity this group has towards...well...everything new is kinda irritating
i personally like the idea of tf2 being a sandbox for new ideas, it opens the door for epic things, and really fail things until the community makes them fix it...
and the research benefits are huge, if they can release a change to one game and it goes over really well, it can be added to the plans for a future game, and if it fails...they don't need to scrap an alpha game, just revert back. Personally I see this info gathering as a much more valuable reason for continuing the updates as opposed to a few more sales.
one thing that can be said though...I give very low odds of tf2 ever becoming WoW...for the simple reason that with the amount of time it takes valve to release new things, it will be years before the rpg elements are ever as large as WoW <_<
EDIT: And nice, a new comp vs non comp debate has begun XD