I don't think your friend has anything to worry about.

The kilt boom is getting a lot of people into the kilt every day now, and more and more people into the kilt for special occasions or even just for church on sundays.

Being a not particularly Scottish person myself, I never would have seriously considered the kilt if I hadn't searched around and found the contemporary kilt makers. A traditional kilt just costs way too much to try out kilt wearing, and has more troublesome maintenance needs. But I was able to get all set up with my first casual kilt with belt, sporran, everything for around $200 (just wore that one yesterday, actually).

Having access to low cost casual kilts has allowed me to get to the point where I'm pretty much wearing the kilt about 6 days a week now. I would not be doing that if I could only buy a traditionally made kilt.

But like I said, she has nothing to worry about... guy like me are popping up all over and we're going to eventually want that nice traditional kilt for going to church in, weddings, funerals, etc. Her market is getting bigger and general acceptance of the kilt is increasing.