Does it really matter if they are both in Austin? Also they could still fuse them to have a bigger western studio. The one thing, Nintendo certainly is lacking in is western games / studios and seeing that noone wants to develop games for Wii U they could well use another studio that at least somewhat fits their style of game development - and has experience with developing for Wii U.
Better to just wait till the studio dies and snatch up the talent. They aren't interested in the Darksiders IP anyway.