Dems currently control only 18 State Legislatures.

Best case scenario... (imo):

Dems gain Arizona, Pennsylvania, Wisconsin, Nevada, New Hampshire, Georgia, North Carolina, Texas, Florida, Virgina.

So thats 27.

So... you'd then have to get 5 Rep State Legislatures on board with this.

Which might (?) be possible, there's still a fair deal of 'National Divorce' sentiment on the right generally.

... and then, all hell would break loose.