Me and my group are definitely going to TBC when it does full release on June 1. I'm playing a Druid bear tank for our group-- we just did Deadmines with me tanking-- and Druid tanks were significantly upgraded in TBC so they could rival Warrior tanks.

If you're struggling with gold, I would suggest buying some. I'm not normally one to cheat, but my group bought 4000 gold for $100 on g2g.com and it helped quite a bit. To the extent that there are rules against this, they are basically not enforced. It's unheard of for anyone to be banned for buying gold.