That would entirely depend on the coverage I could get and how it compared to private. If Medicare is changed over the next few decades to look more like Medicare Advantage, aka Plan C, you couldn't pay me to deal with that.

Edit: its worth noting that your question for whether I'd take medicare is a separate issue from my original point. If the existence of Medicare as it is today was on the ballot, I would vote to get rid or drastically change it. If the program exists regardless of my opinions of it, my choice to take benefits from it is entirely a question of means and comparative benefits of all the options.