Making biofuels from waste is fine, but you can't power but a small fraction of transportation demand with it. So it can't be your sole strategy of reducing transportation emissions.

Most likely what will happens is that those uses that can be electrified will be (cars, city buses, light trucks etc.). Biobased fuels, synthetic fuels, hydrogen and so on will have a role for transportation sectors where electricity is not an option (long range planes, ships, trucks).