They have not?
Deus Ex was a success, they considered Sleeping Dogs one, mentioned Just Cause 2 as an example for long lasting, constant game sales. Tomb Raider seems to sell quite well and only Hitman seemingly underperformed.
Meanwhile S-E relaunched FFVII and VIII on PC but on no big shop, bombed FF XIV into the ground, halted the development of many games to correct that game, couldn't connect to their DS success outside of Dragon Quest and failed to deliver on projects that are long overdue (Versus, KHIII, etc.).
I hope they don't turn away from Eidos or PC, because that wasn't the reason S-E didn't do quite as well as they hoped.