Sorry, that sounded very pessimistic but I think it made some sense ...?
As for funny showing off tricks , I managed to play that easy lick from "The Man Who Sold The World" with my toe (leg's thumb) .
Also tongue harmonics looks cool ... some people start drooling when I do that one.
I think we need a new revolutionary tool (like the Floyd Rose, or Distortion effect at their times) to creat real tricks that are usefull for playing and sound unique (i.e. P.H. , Tapping , Dive Bombs , etc.) ... I hardly believe that something revolutionary would just jump in , but who knows ?!