Fuel tax will definitely be replaced with some other form of car tax, at least in most of Europe. I don't see any way around that.

But I don't quite see how free countryside electricity would mean expensive electricity in cities? Large scale wind and solar will decrease grid prices too, and most people live in cities anyway so the people dropping off grid doesn't seem like an issue for electricity transfer costs. Plus off-grid won't happen anywhere with a real winter, so most of Europe is excluded already.