I do believe this is the future in the marine industry. I think us sailors will be the first to embrace it as we do tend to be keen to our environment. The powerboat crowd will be less willing to adapt: "How much power will that thang put out?", and therefor will take a bit longer. However, down the road, like the auto industry, this is the likely "next step". Personally, I love the concept. How it works in practice, we'll have to see.
Did I just hear someone suggest Hydrogen?