Act I Inferno is fairly easy, and requires a slim amount of money at most to cruise by it. I spent maybe 100k, tops, and got by in one shot on a shoddily played Monk. :lol I'd argue it's easier than the back end of Hell in a lot of cases.
Act II is the issue, because Act I needs to be dropping more sensible loot. No low end 50s crap, no 200 DPS weapons, etc, they also need to readjust some of the tuning going from I to II, it's just silly. Act I should end harder and Act II should start easier.
Personally, I'm fine with the AH being woven into the game , especially Inferno. It's not that much different than the end game for II except it's actually challenging this time and the economy is actually based within the damn game now. I do agree with it being woven in comes a difference of facilitation though, but I like the setup currently and enjoy tooling around with it.
I also *highly* doubt theres going to be some huge exodus to the RMAH when it goes live. I'd imagine it's mostly going to be for ridiculous, truly top end fare and fringe items, not your yellow stat + resist all gear. It'll be the same shit as II, again, but just inside the game.