Move to diesel engines across the RV spectrum a fad?

I find it interesting that the gasoline engines are adopting more diesel like attributes, like direct injection. I believe several makers have gasoline engines that convert to compression ignition at highway speeds in development.

Regardless, diesels are here to stay, and the US makers are having to play catch up with the Europeans (thanks in large part to the disastrous GM 5.7 diesel). I do think that diesel bio fuel will be easier to perfect, and cheaper.