Wow! I was not expecting this!
I understand why you take this decision and in your context I think anybody would do the same, thanks for the software and effort.
I am a bit disappointed cause I have invested fair amount of time learning SGP and not just that I have made some buying decisions based on SGP (ASCOM support and stability is not the same for all hardware).
Why not slow down the pace? IMO the SGP community never demanded more than what you decided to give to the project. I also feel that features prioritization could be better. Why not hire a couple of experience users to deal with the support so you could focus on features or fixes? I am sure that without all the support related task investing 4h a week on SGP will move forward the project and you will regain the joy of coding SGP. Just some random thoughts.
In case your decision if final could you open source it? If the codebase stays static eventually ASCOM compatibility will break and that will be the end of SGP.
Thanks, and I hope you give it a second or third thought, I am sure you can find a midpoint.
Cheers,
Jose