Any flood that can kill a sealed electric motor would likely kill a gasoline motor, too... so that's not a problem.

The most realistic and near-term solution would be an LPG or CNG powered hybrid-electric. There is already a limited distribution infrastructure in place for LPG.

As for Fusion, who knows? It will likely take many years more and probably another trillion (that's right... 1,000,000,000,000) dollars worth of research to even make it feasible. It's like hydrogen research per se... there are too many breakthroughs needed to make it work... it will be a long time coming...