You'd also have to switch all infrastructure to the new fuel source. Like you can't just start pumping hydrogen through the gas station pipes and stuff. Last I recall it makes the metal brittle, and the pipes will burst.
But I'm all for new fuels, I just wanna see some science occur. Look at the energy differences between chemical and nuclear processes. It's huge. Like somewhere between 100-1000 kJ/mol where nuclear processes are like 10^9 kJ/mol. I'm hoping in the future people will wonder why we were burning gas instead of doing something else with it.