This.
What it comes down to is that it’ll only be enforced against someone whose party doesn’t hold either the House or the Senate. That isn’t what it might have meant 50 years ago; but that’s what it means now.
Quite possibly; but they’re not going to do so now, because I doubt you’d get the Senate to agree to anything that the House would.
If we get a blue sweep, we might get legislation before 2028; but we’d have to get the blue sweep first, without it, this year. If we get a red sweep, they’ll either write nothing, or write something that allows Republicans to block other parties’ candidates but not vice versa. The Supremes of course shouldn’t allow the latter, but who knows? And in any case the current Republicans won’t write anything that would disallow Trump.
I’m pretty sure that they’d have to do that by impeaching him again. Even if Trump gets elected but the Democrats take back the House, the chances of getting enough Democratic seats in the Senate to pull that off are nil.