I think a hell of a lot of guys start with a Sports Kilt and work their way up through casuals to a traditional.

A few traditional kilt wearers might buy a casual to wear to the pub but for formal occasions there will always be a need for traditional kilts.

There have been cheapo kilts made for a long time. Some of the offshore kiltmakers that sell for 25 pounds claim to sell 10,000 kilts a year. That's more than all the casual tartan kiltmakers combined.

I think traditional kiltmakers will see a boon from casual kilt interest.