Paul Krugman makes some sense, for once:
Wait, you say: won't raising taxes reduce incentives to work and create wealth? Yes, it will (although such effects are greatly exaggerated in our political discourse.) But means-testing benefits does the same thing. Conservative economists love to point out that means-tested programs like food stamps in effect create high marginal tax rates for low-income families, since they lose benefits if they work and earn more. Well, means-testing Medicare would do the same thing: your reward for a life of hard work and accumulation will be higher copays and deductibles....What we need is actual control of health costs. Means-testing of Medicare is just a badly designed, unfair form of taxation.