For this to actually happen, it’s going to require a major drop in the cost of nuclear power. To some extent, pushing nothing-but-nuclear has been a fossil fuel industry strategy because those high costs and long lead times mean that it’s not actually getting built.
It’s OK - any promise with “by 2050” at the end of it means “We promise that, while we will procrastinate and do nothing about this, our successors definitely won’t do the same.”