I don't think this is true unless you assume some imminent improvement on grid scale power storage.
News reports about how cheap wind and solar are with supporting data based on levelized cost of energy (LCOE) completely miss the fact that intermittent power sources are not substitutes for base load generation. To approach true substitution you have to include overbuilding the intermittent sources or spending money on very expensive storage systems (that may not even exist yet). In either case the cost goes up considerably.
IMHO:
* don't turn off nuclear plants
* invest in more cost effective nuclear power
* invest in more effective energy storage
* invest in more effective solar/wind
* don't pretend that energy infrastructure can be legislated into existence