Unless they want to make macs 3x thicker and throw out battery life it won't happen. People already don't want to develop games for linux, even with the same hardware as on PC, much less try to port to apples special APU's.

The power and size required for "serious gaming" GPU's on mobile is far too significant to fit into a mac size at this time. The term "gaming laptop" is a meme - by the time you've spent $2000 on a gaming laptop you've just bought a jet engine the shape of a brick that does half the work of a desktop at double the price and is terrible for productivity outside of specific use cases. (Like presenting 3d renders or something)

I suppose you could do it if apple were to support proton, and if amd/Nvidia were to standardize their external GPU implementations such that you can just plug in your egpu and have at it. But afaik they're very expensive and use case fitted.