> They can't, with blown up pipes they can't just start receiving gas they need.
Pipes can be reconstructed, peace deals can be made and shut down gas fields can be reopened (looking at you Groningen).
> It really looks like some group wants EU all in, so we should be prepared for the worst possible outcome (WW3, some life remaining on the planet) if that's even possible.
Well if that happens it happens - what's your idea of preparing? To me a quick death sounds pretty good in such a case.