How many seats will red vs blue states pick up with gerrymandering?

[Metaphorical]

6. Gerrymandering is a stopgap

Realistically we may be moving to a model where redistricting is performed every five years rather than every ten, which, if you are assuming that states are not going to give up a numeric advantage when the opposite side is also playing silly buggers may actually be the only viable alternative. It can also backfire - there is a mathematical limit beyond which gerrymandering might actually weaken the incumbent party, especially if you have significant population change in the interim.

This will ultimately end up in a situation where the Red and Blue states no longer recognize the legal authority of the other, which, given Trump's abnegation of the Constitution puts us into Civil war.