Our long national nightmare is over; GFWL is dead. Proof follows;
It seems as though some games are already transitioning away from GFWL support, with both Bioshock 2 and the Batman: Arkham games receiving title updates on Steam which add Steamworks support (achievements & cloud storage) while Insanely Twisted Shadow Planet promises to be GFWL-free soon.
Edit: No-one reads linked articles apparently so in summary; GFWL will close its marketplace on Aug 22nd. If you already own a GFWL encumbered game you will still be able to sign into the service and play it. MS-published games will no longer be offered for purchase, the availability of third party games will depend on the publisher making the game available through another service (which is likely the reason for 2K and WB patching their games to be Steamworks compatible).
Obviously, MS will launch an Xbox branded PC service and offer their own games through that.