We're talking about a world were oil is going away. Switzerland is already using as much hydro as it can. Nuclear is not about replacing hydro, it's about replacing as much as it can of oil.
Even with as much nuclear, hydro, wind and solar as they can, we as a society (not just Switzerland) won't be able to replace oil. We will have less energy, that's a fact. So I don't understand the debate: why not nuclear AND renewables?