Compute please how much the land for a PV field will cost, vs. how much the PV equipment to go on it will cost. Do this for prime farmland, which might be $20K/acre, then do it for west Texas rangeland, which might be $1K/acre.
There is plenty of land. If the cost of land ever became a serious constraint on renewables, renewables will be so cheap they will have already relegated all other energy sources to museums.
As for future breakthroughs: solar and wind could be rolled out with existing storage, but of course improvements are welcome. But turn this around: investment in nuclear requires believing that such improvements won't occur. If they do, your nuclear investment is totally screwed. It won't even make back operating costs. Do you think betting the improvements won't occur is a reasonable bet? Do you think nuclear is going to get financing from hard nosed business types with that hanging over it?
Maybe you're just suggesting continued investment in nuclear R&D, in case all the renewable and storage technologies suddenly hit a brick wall. R&D has a low bar to justify it, so that's not a hard case to make.
