reining in what costs? There's no price caps for providers, and there won't be because the law does not address that. The law only control reimbursement rates for Medicare/Medicaid providers. And that's not including drug prices, another area where it was decided not even Medicare can negotiate better prices. The law is a slamdunk to the insurance industry and the health-care industry as a whole, and a big you to consumers.
Which is why you shouldn't be so quick to celebrate the "they can't kick me out"... since there's no price controls, the extra cost of insuring those people will get passed directly to the rest of the pool (ie: you)
IMO, the best that can happen is the young not enrolling, and the system being ed. Then we can go ahead and change this turd into something else. Hopefully they don't wait to do that until the GOP controls both the executive and Congress.