I wonder if they could expand the Pro desktop to be for serious gamers as well as dev's, videographers, animators etc. It'd be interesting to see what Razor and Alienware make on their systems - could it be enough to justify a presence in the high-end desktop market?

As for bringing gamers to the platform, Apple already has experience with this...from the losing side at least. Originally Halo was meant for the Mac however Microsoft purchased Bungie in 2000 and much like GoldenEye for the N64, Halo was the game that sold enough Xboxes to make the platform solid. Apple would similarly need some top-tier titles to encourage people to embrace an expensive desktop.

Apple's Anobit acquisition seems to be what's giving it the edge in the NVMe arena. They have experience with quiet cooling solutions. The touch bar would be good for key-mapping in games. Back-lit keyboards are their jam. They have a serious investment in Imagination Technologies Group who are behind the PowerVR architectures. Smaller, more reliable PSUs. Their austere industrial design is second to none and deeply contrasting to the garish Razor and Alienware designs.

It would come down to whether there's money to be made in the area, and I suspect most serious gamers build their own systems.