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Government programs are awfully hard to squash; particularly entitlement programs. Particularly wide-ranging entitlement programs. That's why everyone's flipping out over this: because programs like this almost never go away. They just grow, year after year.
Social Security and Medicare are utterly devouring our budget, but we can't even seem to raise the retirement age for the former, let alone genuinely reform it. Bush tried in 2005 and got nowhere (the Democrats, then the minority, engaged in what they today like to call "obstructionist" tactics to stop it), and he was proposing very modest, optional tweaks to the existing system. Government programs are harder to kill than Rasputin Dracula.
That said, there might be a short opening where this can be repealed, because -- get this -- we have to pay taxes on the system for 4 years before it actually kicks in! This is done, I presume, so that they can keep up the fiction that it's deficit-reducing (or even budget-neutral). We'll have to pay taxes for the next 10 years to get 6 years worth of benefits from it. Once people start getting the benefits, though, good luck ever getting rid of it without a full-blown crisis.