That will never happen. States and Feds too dependent on that money.
2. With the growth of hybrids and electric vehicles over the years, the gasoline tax has lost its appeal as a viable mechanism for raising revenue anyway.
The worst thing about the fuel taxes at both the State and Federal level, these funds have been diverted to a number of other programs which have nothing whatsoever to do with providing roads, bridges, or traffic signaling systems with necessary upkeep or replacement for the normal flow of vehicular traffic and allowing for future expansion.
Much of this revenue has been used in pandering and vote-buying schemes for a target demographic, without regard for the original purpose. Meanwhile, roads deteriorate, bridges collapse, and traffic snarls are endemic.
And besides, EVs do not pay into this fund anyway. Just another way they get subsidized.