The problem is, they will raise other taxes to make up for it.
And I fear it will be the property tax. Sales and income taxes are pretty deterministic: earn X and pay Y, or buy X and pay Y. Property valuation is a crap shoot. Additionally, they stack up the rates for a dozen taxing authorities. Of the three, I would first dump the property tax.
Yes. See my #10. A reform like this should factor in all taxes in all areas, not just income. Reform the entire system and lock it into the state constitution. Some will have to go up as other go down or go away but it should address all the taxing authorities at the same time.