That's not going to happen so you can forget about it. Means testing entitlement programs has been tried before and never got much political support from any generation or political party. It's unwise to create incentives for old people to be poor because then workers will be less likely to also save for retirement in their own separate private accounts.

Means testing SS would result in elderly people transferring their assets to other people, much as already happens so they can get free nursing home care. Medicare isn’t means treating but Medicaid is, so we can see exactly what happens.

Means testing will also make paying into these programs even less popular. Upper middle class people will ask why, exactly, they’re expected to pay more into a retirement program they will get less out of. That’s a recipe for political change from a party who promises not to do that.