Is the diesel going to end up going the way of the dinosaur?

You need to go to S America. Just about every vehicle is diesel. Doubt if they are going anywhere soon. Brazil makes a Ford Ranger diesel. All Toyotas had diesel and so did Range Rovers. I love it when someone tells me they get 20 MPG. I'll bet you it gets 9.5 MPG pulling my 31 ft Arctic Fox from VA to Erie Pa and back. My 2006 Chevy Duramax get 19 running from VA to Okla empty but only 17 around N Va. You are welcome to come hook on it.