> Nothing in this referendum directs Berne to do that

The initiative text literally directed the Bundesrat to withdraw from the bilaterals 2 years after exceeding 10m if they couldn't be renegotiated.

> withdraw from the bilaterals 2 years after exceeding 10m if they couldn't be renegotiated

Sure. This is two years down the road. And it is not Article 50. It would cause a shitshow. But that shitshow could be averted and is less comprehensive than directing an EU exit.