Multi-platform announcements incoming? QB vanished from the charts and Alan Wake relied heavily on discounts/bundling so I really feel its time these guys (whose games I do like even though I often find that, since the Max Payne heyday, they've failed to produce a bona fide classic from start to finish) need access to a much bigger market than they've limited themselves to for a while.
Unless they radically change the style and approach of their SP games they need to be releasing on PC and all sensible consoles (PS and XB at minimum) platforms IMHO to maximize chances for success.
They could continue as an effective "second party" for MS but I feel it just hasn't worked out well for them and they'd be better with a different publisher on more platforms.
That all said I do think they're going to have to re-think the viability of expensive short play time SP titles that rely on a key mechanic and end up too repetitive as a result. That's a tough, tough market to play in right now IMO.