As I recall, the deals between Wei and Qin is 3 years. That's > 2 years ago.
So i guess, Wei will wait whether Tou moves or not. Wei have 3 options i think, 1) deal with Tou but still wait 3 years deal ends, 2) Ally with Zhao in <6 months short terms. 3) Ally with Han after 3 years deal ends...