State tax filing

Sorry for digging up this old thread, but I'm planning to move from California to another state over the next two years or so and this would apply to me. I'm working remotely for two different companies in CA: one is W2 income and the other (most of my income) is 1099 income (sole proprietor). Is there any way to get around having to file income tax with CA after I moved out of state? I.e. would it be possible to setup a different business entity (maybe an LLC or S-Corp?) in my new state of residence and then invoice from that new entity instead of as a sole proprietor? Or is the only way to have them hire me as an employee?

Any advice would be greatly appreciated, since that court decision is still recent there's not a lot of information available.