Dometic Marine Air Systems is not going to stock every part on something they don't make anymore and are going to stock & support where the technology is pointed. I just picked up a new Tecumseh compressors for a 10+ year old system. This bill will be up there but still cheaper to repair than replace the whole show. That same compressor is used in many applications, has been around for a long time and maybe be available for a long time still in the future. Heck, It may already be able to run the green stuff and turn up in a new (green) unit. Replacing, upgrading, servicing are real questions regarding r22 to r410, but I don't think there is a fire hurry (yet) to rip out the old r22 stuff.