I think Frank has been considering ending the channel for a very long time. Even some of the Q&As from a long while back had me wondering how much mileage he had left.
I don't think the nature of the hobby was a factor. In fact, many new blasters are right up his alley. We're in a golden age of not only performance but tactically optimized blasters and I think the Frank of 5 years ago would have been absolutely excited. It might have even revitalized him. Plus there are competitive play-styles, like SpeedDart, that emphasize run-and-gun.
I'm sure there are personal reasons he's never going to divulge, but I also think he's just lost his passion for the hobby. I can't imagine doing his job for as long as he's been doing it.
Lemmy is fine so far, but I have some concerns about the long term. Things like who's keeping the platform updated and how is hosting being funded? In 5 years we may find ourselves in a Reddit-like situation where mods start asking for financial backing to keep the community afloat. I don't mean that as a criticism, but even ignoring other factors these services cost money to run. I mean, in this era of inflation and rising interest rates it's core to the problems we're seeing with so many online services. Reddit's leadership sucks and they've handled their situation in the worst possible way, but it's clear that financially they're in a difficult spot.
Beyond that, I expect the Nerfing community to fragment. Whether that's a good or bad thing I don't know. For my part, I'm not joining 5 different groups to keep tabs on what's going on. I've got other interests and responsibilities. I'm happy to support the community here, but I'd be lying if I wasn't a bit resentful that the Nerf Reddit is still locked. I appreciate the protest, but mods are just facet to the community.