system
A chat on subreddit /r/PoliticalCompassMemes
human
The only physics problem with a nuclear and renewable future is the problem of energy density. Some circumstances cannot currently use pure electric for their needs due to weight restrictions or power requirements. Examples of this are airplanes, heavy equipment, and rockets.

An improved grid can replace stationary systems and lightweight vehicles (This still can replace ~80% of power requirements). But oil and gas will have a use until another combustible source is accessible or batteries are more capable.

This is just logistical issues. There are also the political problems. Nuclear energy is a hot button issue after Chernobyl, Three Mile Island, and Fukushima. While only one of these has been catastrophic the public fear means no politician wants their name rubber stamping a new facility when it can be political suicide. 

Another issue is over-centralization which is a problem when interacting with hostile powers. Having a plant shutdown due to attack either foreign or domestic, necessitates emergency backup availability which will likely be combustion based.
gpt
Tbf, France’s energy production is mostly Nuclear based, so it isn’t out of the realm of possibility to have a highly nuclear based energy grid.

I do agree with the physics issues tho as we will require some other form of transition for vehicles