Godot has nearly the same problem and the solution for them is:
a little bit funny and upset at the same time, I guess
https://godotengine.org/article/abandoning-gles3-vulkan-and-gles2
Godot wrote: "
MOLTENVK GOES OPEN SOURCE
However, today, in a completely unexpected turn of events, it seems Valve has found an arrangement with the developers of MoltenVK (the commercial and proprietary Vulkan over Metal wrapper), ported Dota 2 to it, and got it open sourced.
It seems to be a mostly complete Vulkan implementation that runs on macOS and iOS. This pretty much lifts the only barrier we had for moving Godot to it."
Apples forces all the time. Maybe they don't support it in there SDKs anymore, but can't imagine, that older OpenGL games don't work anymore. The next thing is, my MacBook Pro from 2012 is great, don't need a new one, but the new OSX is not supported. So the problem will not affect me.
I guess, it is a long run thing. We will see it in the next two to five years. And maybe Apple will combine Intel-CPU-Macs with ARM-iPads and iOS and OSX will be one thing some time.
But who cares? If a gamer wants to play games, he/she will have a gaming device. AppGameKit runs on a Raspberry Pi and on Android. So developers could develope and gamers could play. And e.g. the Raspberry Pi or the OUYA are cheap. And in the next two to five years the hardware will get even cheaper.
Does anybody creates games, which are only run on 1.600,- $ iPhone X3 or what? For most games an OUYA works or a PC like the ne Atari VCS for about 200,- to 300,- $ or on the XBox One S for less.
OUYA in the UK ~ 19.99 £
https://www.game.co.uk/en/ouya-console-215307
Atari VCS
https://www.indiegogo.com/projects/atari-vcs-game-stream-connect-like-never-before-computers-pc#/
And when ARM processors are printed, they are cheap as some cents and so the hardware would be. Complete PC printed maybe for the price of a magazine or newspaper. So cardridge and PC are the same in the future.
Who cares about, if it runs on not open hardware anymore