I came here to say more or less this.
While funding road upkeep with fuel and car taxes makes sense it isn't necessary, we don't fund emergency departments with taxes on trampolines and skateboards for example.
The greater policy need at this point in history is to increase the uptake of electric vehicles(really to reduce the use of fossil fuel vehicles in a variety of ways, including uptake of EVs) and future policy should reflect this, not commitment to past policy.
Excellent point well made.