They still have some MVVS .15's available for people too. The MVVS 10cc diesel is still available as well for those wanting a .60 engine size.
PAW still makes some bigger diesel engines too, such as the .29, .35, .40 and .60 engines.
Everytime a PAW .60 comes up on Ebay, here in the USA, it sets off a feeding frenzy of bidding, and usually goes for more than to just buy one direct from PAW.
So I think there is still interest here in the USA for big model diesel engines. There may be some locales that have a large number of modellers interested in diesels and using them, but I am not sure where though.

With Davis Diesel Development making conversion heads for many engines, one can convert a RC glow engine over at will. Plus you can convert a Supertigre G4500 over to diesel and it runs really well as a diesel too. Of course it has one wondering if they converted a Supertigre 60cc inline twin to diesel as to whether it would work good or not. It is two ST G3000's connected to make a twin.