Pensions (especially) and life insurers are going to need/want bailouts regardless of medical changes. The combination of global ZIRP and absurdly optimistic assumptions about investment returns have led to extreme underfunding for nearly every pension fund in the developed world. This problem is especially acute in the United States but is not unique to it.
The extra uncertainty in actuarial assumptions will only leverage that problem further. Your assessment of expectations is actually pretty reasonable: pension fund managers aren't taking it seriously because they expect to be bailed out regardless, so they may as well enjoy their moral hazard dividends in advance. But I think that has more to do with the fact that financial repression and systemic underfunding have rendered everything else irrelevant anyway.
The extra uncertainty in actuarial assumptions will only leverage that problem further. Your assessment of expectations is actually pretty reasonable: pension fund managers aren't taking it seriously because they expect to be bailed out regardless, so they may as well enjoy their moral hazard dividends in advance. But I think that has more to do with the fact that financial repression and systemic underfunding have rendered everything else irrelevant anyway.