One aspect I wonder about is not so much about whether the collective gaming-on-linux effort can close the performance/features gap, but keep it closed. The story has been that windows is the main target system for "PC" game development and hardware/drivers (for good reason, it has majority market share), and then linux lags behind as various efforts figure out what's missing and how to implement.

Right now and for the foreseeable near term (3 years or so?) it seems like the focus on GPU advancements isn't aimed at gaming so will be a period of stability, but I wonder if/when focus does come back to gaming, when there's a new round of consoles, when a company wants a new feature set to distinguish a new generation (like geforce 20 series versus 10 and earlier), what can be done to make sure linux users aren't second class citizens. I'd also wonder about development tools, to use the most popular engine as an example, what could change with unreal engine to make sure it builds software that plays nice with the linux ecosystem even if the tooling works best under windows.