Nothing is preventing them from doing both. Dealing with nonworking wine games is incredibly frustrating (and often fruitless).

But I can see it working. In addition to being able to fix issues in the software itself, they are also working with a known hardware configuration and they can sandbox each wine instance.

PlayOnLinux already helps doing the latter, to the point where it lets you use separate wine versions for each sandbox. Much better than using synaptic to jump between different package versions.

I hope they'll stick with native versions, though.