Could it not be argued that one married couple serving 12 or 16 years in the presidency violates the principle of the Constitutional amendment that bars presidents from serving more than two terms? Would it have really mattered if Eleanor Rossevelt had been the figurehead president during what were FDR’s final terms? It’s an end run around the amendment which was ratified by Congress and 2/3rds of the states.
And should some president be callous enough, they could win two terms, get there spouse to win two terms, then divorce her and get two more terms out of the next spouse. Wouldn’t it be a mockery of the Constitution to violate the intent of the amendment by electing spouses in perpetuity?
Mockery? Yes. Violation? No.
So, you're saying that though the text says nothing about this, you find the principle implicit in the penubras of the Constitution. Too bad Justice Blackmun isn't alive to write an opinion for you.