"Are wind tunnels a waste of time or even just a passing fad?"
In my view no, i'm English and have the misfortune of having the British climate to contend with - we now have 2 south central windtunnels, Bodyflight at Bedford and Airkix at Milton Keynes.
These 2 establishments have provided a whole new dimension to UK skydiving, especiallyfor the student and formation teams ........... ther eis also the aspect of wuffo involvement, and I believe that many of these wuffo's will go on to take up the sport itself.
If as is common, the clouds are over - the UK is grounded and staring up at the skies waiting for a miracle is pretty disheartening. I believe that the windtunnels have been the biggest break through in the sport since the development of the square canopy and will be with us und improving until the end.