Well, the states where the leftist residents wish to live in a leftist world, then I suppose let them if that’s what they think they want (since you can’t stop them anyway). The producers will eventually leave the state for a saner residence, the non-producing leftists who are left will find that the emaciated money sow in their state government will eventually dry up - and then, good luck to ‘em.
California will become a Hippie Wasteland.