I left CA 3 years ago and they DID try to make me pay a leaving tax! Franchise Tax Board kept sending me letters every year telling me how much I owe them, since I failed to file a CA return. Haven't gotten one this year yet. Luckily my husband's a tax guy who can write them letters, because they kept trying to make me prove I didn't owe them money.
They did the same thing to my brother when he moved to
Alaska.
When I worked for China Lake NAWS, there was a lawsuit about CA trying to tax people's pensions when they moved to Nevada (no state income tax there). The end result was that CA couldn't tax a pension even if it was earned in CA. (I imagine because if a person moved to a state with a state income tax, then they'd be taxed twice). I can't believe CA even tried something that underhanded.