Thetford, which makes Norcold RV refrigerators, just announced acquisition of Nova Kool, which seems to have a lot more capabilities in DC and AC compressor refrigerators for RVs, marine, etc.
Thetford Announces Acquisition of Nova Kool Mfg. | RV Business
There is little doubt that there is a trend towards compressor refrigerators, or away from propane. That’s not to say propane will disappear, because some RVers will be better served by propane.