What are people going to do if Trump is re-elected for another 4 years? It's plausible this will happen by virtue of their democratic voting system. Not sure Biden can keep saying it's a war against good and evil, light and dark. People want a little more detail than that but I doubt detail will be Biden's strength in the presidential debates.
The polls are rarely reliable sources of voter intention - so this will be an interesting few months.
I doubt Boris will be going anywhere for the next few years - he was given a mandate and it's likely he will see it through and go for a second term.
Is this universally popular - probably not but then people have had to accept leaders they personally didn't vote for.