I agree with Nick that with electric vehicle use growing, they need to chip in to infrastructure the way petro drivers have been doing. However, I also agree with Boomhauer that unless there is some REAL guarantee that the funds will ONLY go to actual transportation infrastructure (and not, for example, "the equity of roads"), it's a non-starter for me.
The current taxes seem to go to everything but roads. I also doubt that if a mileage tax was introduced, we would see gas taxes eliminated. With dems in charge of it, this is just a way to double taxes for most, or to punish petro drivers and push electric.