I predict that, at least, two more mergings will be announced, even if the lastest news tell that Eidos is no longer seeking for it.
It makes sense...
There were rumour back when Bioware was bought that EA might change to EA Bioware, or at least, open a new internal studio, giving Bioware all the independence in the world, but keep it in their "family" (i still think that it will happen, with or without a name change).
Activision is now Activision Blizzard.
Publishers will need to merge if they want to compete with them, because the only two with fame and fortune to do it is Ubisoft and Take 2, and even them...
I imagine a Ubisoft/Atari merge will happen eventually, the same with THQ/? (insert name).
The only that i can´t imagine not going for the merging angle is Take 2 (with their 2K brand, they don´t need it).
If mergings are not a go, there will be endings, and i predict either Midway (one of the worst, except Mortal Kombat, they have nothing do hold to) or Codemasters (they can´t live on Colin McRae alone) going down