There actually was no "shift". The gas tax had been out there almost as long as the income tax. And it has not been raised in 25 years. Not sure what the argument would be against a tax to maintain roads that is tied the fuel used on those roads. Sure it is "regressive". So is the cost of gas. And heaven knows the roads need repairs.
When you run up the deficit by giving most of the tax cuts to the wealthier folks and the companies, then feel the need to run down the deficit by charging regressive fees or increasing regressive taxes or cutting entitlements most critical to the less wealthy - that's the "shift" I am talking about.
We could argue that this shift is a bad thing or a good thing. But it's hard to argue that there is no shift.