I hope I'm wrong.
Given the demographic trends, I think you’re correct.
The only confounding factors I can see would be
1) markets finally puke on money creation making entitlements too expensive to continue at present levels
2) a 3rd party candidate (would have to be a liberal analog of Ross Perot, egotistical, famous and rich) lets us win with a plurality.
Bloomberg is one possibility, but he’s tight with the Clintons and would never oppose Hillary.