Even if your gear got screwed over in the IAS patch, you can go back to Act 1 Inferno and farm that for awhile. My friend (a DH) isn't even that geared, only about 22k DPS or so and he's progressing in Act 2, although a little bit slowly. He farmed Act 1 after the patch (you don't even need that much gear for that), and he's been finding a decent amount of ilvl 63 items.
Honestly while I think there are legit concerns, some people appear to be bandwagon jumping more than actually playing the game. IMO if you've poured at least 40~ hours into the game you've more than gotten your gameplay's worth of money. Why not stick around and see how they try to improve your experience??
And to be fair, I'm not saying I didn't have any issues with the game. I main a barbarian and I pretty much ran headfirst into the brick wall of Act 2. So I took a break until the patch came out, and now I'm in Act 3, and progressing slowly through that.