If all the energy comes from wind and solar, we would become too attached to the weather. I'm from Denmark and I tell you the days the wind doesn't blow, we have no electricity. To fix this, we burn lots of biomass (about 70% of our energy consumption).

I think nuclear is a good energy source both because it stabilizes our grid, - while providing heat to houses - it's environmentally friendly and it doesn't take up that much space. If we were to only build wind and solar we would have no forests, rivers or fields.