Was driving around lovely El Paso this afternoon, and one of the local radio guys was talking about taxes on California businesses, and he mass exodus of residents from the State. Cali ranks near the bottom of the rankings for tax-friendliness, causing businesses to leave for greener pastures..
So at some point, California is going to have to do something to slow/stop the productive workers from leaving. My prediction? That California will introduce a tax/percentage "fee" on the profit from selling your house, if you don't use those gains to purchase another house in California.
Say you have a capital gain of $75,000 on the sale of your home, and that California enacts a law that if you take those funds, and purchase a home out-of-State, you get hit with a 20% "fee". If you choose to leave, the State gets a nice windfall. If you don't want to share your profits with the State, It gets to hold on to you (and collect more "regular" taxes) for awhile longer. Win-win for the State.