As someone who wants Trump to lose in 2020, are you more worried about Democrats facing up against an incumbent President Trump, or incumbent Pence ascending to the presidency after Trump either resigns or gets impeached?
I'm personally more worried about Pence; he may be more conservative than Trump, but he's also a lot more stable and calming, which could remove a lot of the motivation and militancy behind kicking the Republicans out of office.
Pence being more conservative than Trump will help him actually because that way all the republicans will like him