The chances for that to happen are not so big, since it means to stop very long term contracts and pay damages.
The discussion over the Russian gas is a bit strange. Somehow I feel that neither of the parts (basically Russia and Germany) don't want that flow to stop.

But older coal and nuclear plants will make electricity again instead of gas, GPL is being transported on a big scale, and maybe, just maybe, the other producing countries can chip in.
After all, it's a resource they'll sell for good money.
Yes, more pipelines need to be built, more nuclear power plants need to be also built, it's a long term thing... which should have been done long ago, really, to allow competition and free market.