We will all get dumber, computers will all get smarter.

Technically yes, But the economic, technical and safety difficulties are absolutely prohibitive.

The first and most obvious problem is where do you get the hydrogen? The energy balance of electrolysis hydrogen is utterly terrible, and natural gas is better left as natural gas. And it just gets worse as you start to look at the other considerations.

So the true answer: its possible but you definitely dont want to. Unless you are a fossil fuel company trying to greenwash.