Most countries will be raising taxes on fuel even more and in general it will become less available fast: gas stations, mechanics who know how to fix the ICE old timers etc. it will become a hobby thing (like old timers today already). Certain niches will keep ICE way longer (heavy construction vehicles etc) but it will suddenly become quite rare in 20 or 30 years to see a regular old ICE driven by a regular person doing regular things like commuting or so.