Liverpool would be the only club I worry about with Unai, any of the others I don't think he'd want it, but them there's a slight doubt.
You're worrying about nothing. There's zero chance Unai Emery will leave us before his contract expires.
That is good thing - who could he actually go to? He is Basque so Real Madrid is hard to see and he is not big enough. Simeone ain't going anywhere. Barca? He has managed the others in Spain.
Only place is Italy he could go to - maybe Inter or Napoli at given time. Chelsea or Liverpool the one after the next?
I may have missed something - Dortmund?