I would not say that the future is that bleak. At least here in Finland we have seen quite a decent influx of "young" windsurfers during the last few years. And we seem to be on a constant hunt for more gear storage space (i.e. containers) at the beach. It has to count for something!
I do think growth of the sport requires the old guard to set up "facilities", especially storage at easily accessible and popular beaches.
And if we play our cards right there ought to be a second generation taking up the sport!