The Nintendo Switch already provides >160 million reasons for gamedevs to care about native ARM support, but that hasn't moved the needle for the Mac. Being ARM-based is the least of its problems, the problem is that it's a relatively tiny potential market owned by a company which is actively hostile to the needs of game developers.

The switch is underpowered to the point that most A(AA) games cannot run on it without a ton of effort and compromise, an M chip powered device would be a different story. But anyway it's never going to happen, just daydreaming about a perfect gaming setup...