If robust, affordable storage technologies that can smooth out the volatility inherent to solar/wind energy become available for a variety of topographies and climate zones, then we’ll be in great shape to reduce GHG from power generation without adding nuclear. Whether this will happen in the next 5-10 years is not clear (at least to me).
Robust, affordable storage at very large scale will be developed for vehicles, even if nuclear were to win. A Tesla might have 70 kWh of storage; there are 283 million motor vehicles in the US. That's about 20 TWh of storage right there, or about 40 hours of average US grid output. (This is not to say the vehicles' batteries themselves will be used for grid storage, although they could be.)
