The first and second thresholds need to raised, probably to the current level of the second and third respectively, which means pushing the third up as well. To balance this out, we probably need a fourth threshold - maybe $250,000 - where income higher than that is taxed at something like 45-50%. So the net result would be roughly the same amount of tax collected. But with the tax burden shifted from those on the bottom of the income pyramid, to those getting paid more than $5000 a week.
(8/?)