Anyway in my view the value of CHF is only headed up in the long term, so holding on to excess is unlikely to be a losing proposition - especially since the Swiss National Bank has in the past few months adopted a policy that all Swiss banknotes from 1976 onwards will retain their monetary value indefinitely. Previously, the notes issued between 1976-1993 were due to become toilet paper 3 months from now, and the notes issued from 1994-2016 were likely to become toilet paper around the year 2040.
When I used to work in an international tour operator, all international transactions were done in CHF because, at the time, that was the most reliable currency for holding its value against all the others we used.