I had a feeling about hair salons for some time but since this thread started I've been counting - I know of 5 new salons that have started up on my way to work in the last couple of months. All salons on my route (17 of them) appear to be busy. It costs my wife 100 CHF to step in the door of one of these places (she uses an English speaking guy).

So I think such a business appears to be a viable option for Switzerland - looks like there is always room for one more hair salon.