I think it would be more like us taking on someone like Mark Noble as manager in the future.
Espanyol have never been Barcelona's tormentors, they're just the noisy little brother. Poch turning his back on them because he's too big for them would probably be received quite favorably by some.
Of course, Poch's history of saying Barca are "not the people's club" and all of that might create some additional problems.
The one factor that should be mentioned is that Espanyol were relegated this season, so Poch wouldn't have to play them, at least not next year.