Nuclear power is shrinking with no new plants being built and old ones being decommisioned. So spreading is definitely not the word I would have used either.
Micro nuclear reactors are being built not far from me. I expect nuclear to grow substantially in the US at least in the midwest. My state is already green with many windmills, solar farms, hydro plants. The only thing they have not explored very far yet is geothermal and there is plenty of opportunities for that here too.
I'm skeptical that micro nuclear reactors will ever be economically viable (without subsidies) for grid scale power production. There are huge economies of scale in fission power once you account for labor costs, site security, and thermodynamic efficiency. Bigger is better.
Micro reactors are more suited to isolated areas disconnected from the grid.
