I would at least consider the ramifications of the other component of that initiative: It makes it really hard for the legislature to ever raise any sort of gas or car tax/fees in the future, because every single increase has to be approved by voters before it can go into effect. That is a terrible way to run a state, especially considering the legislature already needs 2/3rd vote to approve new taxes. There is no guarantee voters will approve even modest increases that are needed to actually fix roads if conservatives can whip up generic anti-tax sentiment each time.
They should have just done a simple repeal of the gas tax only. At least that would signal to the legislature that it's unacceptable, and they need to go back to the drawing board.