Many (all?) of the people using windows 7 as their only OS at this point are zealots. It’s not surprising that some would respond that way. It’s largely a group of people who will never willingly change their habits and any removal of support is an assault. There were many valid reasons to not upgrade to 10 but the rational people have given up and upgraded or migrated to Linux/mac over the past decade.
Why as their only OS? I assume many people connect their old PC to their TV and install a bunch of emulators. I suppose Linux could be an alternate solution for those machines.
[dead]
They are committed. I found this kernel extensions project: https://github.com/i486/VxKex
Perhaps that'd be the OpenRCT2 fanatics' salvation.