Could fewer manufacturers have anything to do with that? The hobby overall is shrinking , it does not take a brain surgeon to see this. Of course you will claim that 700,000 MR owners are part of the hobby. On this we will disagree. IMO most of those were purchased as a camera platform where the owners actual hobby is photography. And a fair share of those were flown a few times and put away. I would be surprised if the FAA registration numbers didn’t decline over the next few years as the newness of the MR fades.