Earlier quoted context omitted.
It was reported in The Nation (and nowhere else that I ever found when I went looking—so, grain of salt) that Obama said that all the totally unnecessary jobs that’d be eliminated are exactly why he wouldn’t push full single payer. It’s a regressive-tax-funded white collar makework jobs program. JFC.
He didn't have the votes to get single payer through Congress. Simple as.
I think the Nation’s quote of him on the topic points out something that may be true, which is that he might have balked at doing it given how many people would be laid off (hundreds of thousands, surely) and what the optics of that would be, though I kinda doubt the quote itself.
But yeah, even if he’d been gung-ho behind it, it wasn’t happening.