Sci-fi's always going to be dated in 20 - 30 years, unless it's the very rare type e.g. 2001. Even now I'll watch a sci-fi movie made in the past 2 years, that is meant to be set 50+ years in the future, and it'll have an internal combustion engined'd car/truck complete with diesel engine sounds, and the displays will be basically modern day LCD panels.

Sure banks of flat LCD panels look sleek now, but then so did banks of fishbowl CRT panels in the 1980's and look how dated they are now.

My prediction would be, if Fusion isn't developed in 50 years, hopefully they will invent a very good, cheap, energy dense, quick to charge energy storage mechanism. E.G. something the size of a laptop battery, that holds 5 times as much, doesn't degrade, can charge in 5 minutes, and costs $10. Then the actual energy source won't matter so much as there'll be so much storage to use.

And I guess a sci-fi story can involve fighting over a windmill or hydro plant so the heroes can charge their batteries to power an RV - like Mad Max though instead of fighting for a rig of guzzoline, they can fight to charge a trailer battery that would last a month and can then be recharged again.

A plot point might be these storage solutions are very volatile, after all they would be very energy dense, that would be a problem to fix