I've already stopped trying to progress my existing 70 teams, and feel in some way "released" from that.

I'm now doing a whole load of different things, including bringing up a new team that I'll get to 70 just in time to continue levelling them right through to 80

I don't want to derail this into Yet Another Speculation Thread, but there was a flurry of speculation a while ago that WotLK would be around November. That was reading between the lines of a financial report from Blizzard as I recall, and would suit me fine.

Do you guys think we might see a situation where the current heroic instance/badge gear grind is eliminated by plain old questing fro 70-80 in WOTLK?
Yes.