I read the Forbes article. It did not say that. It said that an analyst was concerned that EA might shut down SWTOR if it kept loosing subs, which is silly. They have not shut down DAOC or Warhammer have they?
Besides, Something like that is generally also unenforceable. Worst case, LA might have a clause in the contract that says if EA changes hands, LA has the option to renegotiate one or more contract terms.
Your comparison is not valid. You are unaware of operating costs of SWTOR in comparison to DAoC or Warhammer. Assumption are just that.