Sure, as long as we also get rid of all urban growth boundaries. Be careful what you wish for, a free market city won't look like what you think it will.

Go for it. A free market city won’t go outward because nobody is willing to pay usage based pricing for highways.

They already do in many places. Toll roads exist, and the gas tax pays for almost all of the highways anyways. Transit is subsidized an order of magnitude more. A world with no subsidies looks more like suburban sprawl than a dense transit focused city.

Show me evidence. Gas tax doesn’t cause market decisions.