The costs for nuclear plants always leave out the massive subsidies routinely given to the industry and largely ignore the costs of decommissioning and dealing with the waste. Even then they overrun massively and seeing as you cite Finland: how about the clusterfuck of the recent reactor build there?
The current noises coming from RWE, E.ON, et al. are timed to coincide with the German election and also as part of the ongoing fight about lost profits as a result of the current's government decision initially to extend the lifetime of nuclear power only to turn 180° within a year.
Renewable energy is far from a fairy tale; it is simply a requirement in countries without their own energy reserves. German industry is largely being shielded from price increases which are pushing consumers hard. Indeed some German companies are taking advantage of the situation to produce their own energy. German policy will no doubt be reformed after the election but nuclear is not an option. As retroactively adjusting feed-in tariffs would most likely be legal, electricity is going to continue to get more expensive (at € 0.25 / kWH it's already eye-watering) but plenty of adjustments can and will be made. Shale may well become an option in Europe but even without it, the possibility of synthesising transport fuel using renewable power is starting to look cost effective and would be a good way to handle the surplus production on windy, sunny days.
Furthermore, it's worth noting that even with such expensive electricity, inflation in Germany is significantly below that in the UK, where the chances of the lights going out are even higher despite the pro-nuclear lobby.