Unless they plan to provide corporate sponsorship or something for Wine as well. Then they can just tweak Wine and get ports out much faster.
This has been a long time coming with a lot of little announcements along the way. A while back
valve made a big deal about how they managed to tweak linux with the help of nvidia/amd/intel to provide better framerates than windows 7 (let alone osx) on their own source engine.
Then valve released a steam linux client, and heaps of indie developers quickly got on board. After the steamos announcement, we found that out valve has had nvidia engineers stationed at valve for quite some time tweaking performance to its maximum.
A week ago
DICE were saying that all it takes is one killer game (like halo was for xbox) for linux to kick off in the gaming scene.
Then two days ago, more DICE
rumours surfaced suggesting the possibility of Battlefield 4 on linux - after Lars revealed the FrostByte 3 engine has been ported to linux
The target here obviously isnt wine ports and half arsed releases - which has helped gaming on mac, but also kept it second tier (along with poor opengl performance). What valve wants is AAA developers to release proper native games, with engines tweaked for highest performance.
I'm hoping it happens, but am also a bit sceptical on how many will devote resources into it. Its a vicious circle, and Lars is right, all it takes is a few killer games to kick it off.