Earlier quoted context omitted.
The major factor Apple has working in their favor with regards to the future of gaming on Macs is iOS. Any game or game engine that wants to support iPhone or iPad devices is going to be most of the way to supporting ARM Macs for "free". My older Intel Macs I'm sure are more or less SOL but they were never intended to be gaming machines.
iPhone games are an entire different beast however, and likely not what people “want”. At least we still have Minecraft.
Most of those mobile games you're thinking of are made with Unity, Unreal, or one of a few other general purpose game engines. Those same engines are used for a significant chunk of PC games as well. The AAA developers who have in-house engines like to reuse them as well. It doesn't matter if a given game does or does not support mobile if it uses an engine that does.