So shutting down old nuclear power and replacing it with wind/solar backed up by gas was not a crazy idea.
Was is a crazy idea is then letting 'the free market' take care of the gas supply.
Where is gets more complex, natural gas is not just used to generate electricity, but also to provide heat for lots of homes. Keep old nuclear power plants running doesn't do anything for keeping people warm.
In short, Europe has a natural gas problem, not so much a nuclear power problem.