Welcome to the nut house!
VW at least is walking back from diesels in the short term. GM seems interested in giving them a go with the Colorado/Canyon, Cruze and Equinox, but they have tried diesels in the past and lost interest.
Mazda keeps talking about introducing diesels, but they've had a rough reliability history with them overseas, so I wouldn't rush right out for the first couple of years.
There isn't as big a difference between diesel and gas engines as there used to be as far as fuel consumption. Diesel can also be more expensive at the pump and, of course, just getting the diesel option is a pretty big premium over an equivalent gasser. A person would have to do the math to see if there would actually be a payoff for their particular circumstances.