If they are pondering this, they are expecting a Trump win.
They want union when they rule, secession when they don’t.
The left has never let consistency get in the way of their path to power.
In the real world, the map is not the territory.
There are many hard-core conservatives in states ruled by leftists (as I raise my hand) and there are many hard corp lefties (particularly in the urban areas) of states ruled by conservatives.
The divide is mostly urban and inner suburban vs outer suburban and rural in most states.
It is just a mess.
If democrat hellholes want to leave the Union - who would want to stop them? They get to take all the antifa and BLM rioters with them? Works for me.