Interesting thread. The "yoof" here in Hood River aren't winging, they are a new generation of groms trying to megaloop Dad's old kites. Have you tried jumping with a wing lately? Meanwhile, many of the old-school windsurfers have moved past kiting and windfoiling into winging. Easy launching and toting of the gear, and they are up in the swell in no time. But I recognize Hood River is not everywhere...
Just got my first foil on closeout to mount on a Slingshot Converter and give it a go. Early in the pandemic I had the line of thinking shared by many others I've talked to, in that windsurfing/windfoiling can be solo-launched just about everywhere. I already have a garage full of carbon masts/booms and old wave sails (which ironically exhibit the 'locked draft' behavior of new foil sails), so I figured I could get a crossover board (JP Foil Slate or Starboard Hyper Nut) and use a larger front wing setup to play around with windfoil and SUP foil in addition to using the Converter setup to kitefoil. I borrowed my buddy's Slingshot setup and went windfoiling a sum total of three sessions. Fun, but not worth the investment - and forget about wings to rip my should out of socket, just lifting that damned setup was enough!
I'll stick with kiting/kitefoiling as long as there is still a sandbar here. OzBungy nailed it - these have always been fringe sports and their growth will come and go, but I'll probably be able to buy a new kite next decade. Sailworks is still in business, Northwave too (and will partner with a wing company soon). Airush used to make sails now they have a wing - like most kite companies do/will. I know skiers who tried snowboarding but simply stuck with what they knew - and they still buy new gear and take trips, although their new skis are shaped surprisingly similar to snowboards. I know a woman over 90 who still windsurfs (but I doubt she'll take up winging). And without foiling there really isn't a massive case for winging, so there's that too.