Changes of automotive power is not an easy move as it can't be done over night . There are moves you can make like the changeover from steam to diesel power on commercial vehicles ...Government put a tax on unladen weight ...poor old steamers didn't stand a chance . Almost an overnight change .
All joking aside Hyundai have invested £5.5bn in hydrogen fuel cells, so maybe not that far away from being affordable.
I love the work thats gone into it - but it's a "just because we can" project.... "can you just slip a new timing belt on it please?......" "errr...that'll be 12 hours labour..."