A Federal bailout of state pension obligations becomes a political (not financial) problem. Why would states that are 80%+ funded agree to bail out states that are only 50% funded? Do the states that are 100% funded receive a credit to use in other ways? There's also substantial moral hazard; if the Feds backstop state pensions as-is, they would be rewarding numerous instances of local self-dealing. This would be an order of magnitude more expensive and more contentious than TARP, which barely passed even as the economy was (supposedly) near death.
I think it's more likely that we see what happened in Greece: significant property tax hikes. You can siphon a huge amount of value out of the real estate markets through gradual but steady increases in taxes and fees, if you're willing to sacrifice appreciation (see Chicago). Ironically this may be a great way to promote affordable housing too, as residential real estate becomes a less attractive investment.
"Unsustainable" pensions are a politician's way of punting the issue -- rather than hit the budget today by paying market rate, they promise far above market rate later on when some other sucker is in office. And everybody -- including the people whose taxes will end up paying for it -- falls for this over and over and over.
I don't know about everybody. Lots of people benefited from lower-than-possible taxes over the years, sold their houses for large piles of cash, then move to Arizona or Florida or something where taxes are lower, houses are cheap, and there's no snow.
He was going to be the next Chris Christie/Scott Walker and then would be a presidential contender for 2020-2024.
Fast forward 4 years and he's achieved none of his goals, further entrenched his opposition, almost lost the Republican primary to a far-right flank, and is now ranked the 2nd least popular governor in America.
Oh and he left the state without a budget for half of his first term because of a failed grudge match with the speaker of the house, which increased our cost of debt and messed up the financials for many colleges in the state... among other things.