Just start now. Think of unsupported games as you think of games for Nintendo and Sony machines. Your financial support of gaming on Linux will encourage developers to support it. Waiting just keeps the status quo.
I did this a few years ago with the same mindset, thinking I’d still regularly boot into Windows, but I haven’t done so in probably over a year. I was surprised at how little I missed the games that don’t run (well or at all) on Linux—probably because there are so many good options these days.
At this point I’m thinking of deleting my Windows partition altogether.
