You can’t see developers wanting to reach a new market with a large user base top level hardware?
I don't know why I'm bothering, maybe for the benefit of someone who's reading. But here it is:
First, it takes several years for this user-base to be meaningful in numbers. It's not a large user base now and won't be in a couple of years. Apple is still selling high-end Intel macs with AMD GPUs and will continue to do it into 2022. What you describe (large Apple silicon user base with powerful GPUs) is several years away. These current products will be 3-5 years old, and quite likely obsolete.
Second, Apple will need to develop the software side of things to allow this to happen. So far, they haven't done so and they've shown no indication that they're even interested. What they've done for gaming so far in Metal has been heavily focused on iOS gaming rather than desktop AAA games for macs. Maybe this changes in the future, but it won't change overnight. It will take years, and again, by then current generation of products are old and obsolete.
Third, the rest of the hardware is just not gaming optimised, e.g. the screens have very high response times, because Apple cares about colour accuracy and sharpness, rather than speed. So to compete with gaming laptops, Apple needs new hardware too, by then there will be new chips.
Fourth, assuming we get feature parity between Metal and Vulcan/DX12, these GPUs in their microarchitecture are heavily optimised for compute. There's a reason AMD can match Nvidia in gaming but not in compute, and there's a reason Apple is easily catching up to AMD in compute, but not in gaming. The microarchitecture priorities are different. That means even if all the above happens, Apple will still need to prioritise gaming in their future GPUs microarchitectures, i.e. products that haven't been released yet and won't be for a few years.
So to make it clear, these
current products, and the M1 Pro/Max, won't make a difference to the gaming industry and won't be gaming laptops. Whether things will change in the future is irrelevant, these products won't be part of that future even if Apple becomes king of gaming.