Germany actually replaced the nuclear energy with wind & solar. The argument that remains is that instead of phasing out nuclear, reducing coal would have been preferred. The decision to phase out nuclear has long been made (for good reasons). Keeping them active or even building new reactors of that kind is not an economically viable solution. The price Germany pays for this is higher carbon emissions for the time being until renewables push coal out of the mix. What Germany gains, on the other hand, is the removal of the most expensive form of energy from its production and one big step towards a fully renewable and modern electricity grid.