QFT
Removing gas taxes means that they have to be made up somewhere else. That really can't be done without creating a whole other base of problems. Not only that but the US is in alot of debt right now, so they can't just disappear.
Besides, isn't the consumption type tax system similar to the gas tax system now? I could be wrong, however wouldn't that create a bigger problem since ppl are already accustomed to the current tax system and looking at how they react to gas prices with a similar system to that of the consumption tax, it would not be well percieved.