Bernie would not have won in 2024. In hindsight, it seems clear that winning in 2020 was at best a booby trap. If Trump had won re-election, the Republicans would be grappling with inflation anger (since absolutely none of his policy preferences would have slowed it, if anything they would have accelerated inflation)
Now, as usual, the Republican is going to get credit for the hard choices the Democrat had to make in office and the vibes that "Republicans are better for the economy" will continue, unless his tariffs fuck everything up so quickly that even the oblivious can't ignore it.
Not without Supreme Court fuckery. As it stands, he'd be eligible to serve as Speaker, but he'd be skipped in the line of succession if it were applicable.
Of course, trusting the Supreme Court to actually follow the rules seems naive at best these days.