Free-wheeling hypothetical: President Pelosi ... how would that work?

Admittedly highly unlikely ... but also becoming less inconceivable by the day. She is 2nd in line after Pence.

So, let's just say, 3-5 months from now, They swear in Pelosi as the next POTUS. What does that do to both Repub and Dem Primaries? What does it mean for the next election? Does the US keep itself together long enough to have an election?

Heck, while I'm asking, what about a President Pence in 3-5 months. That's at least an order of magnitude less unlikely. How would that play out?

PS: Somebody recently started a 'what do you daydream about' thread ... so, you-know ... this.