u got some good points and bad points in there, firstly; it's sad but true, Jason Becker won't be remembered in 10 years, becuase although he was fast I dont think he contributed to the music, like Vai and Satch who i reckon did contribute, they are like the Beethoven and Bach of guitar.

I don't agree when u say shredding is showing off, why is it more showing off than slow music? They both require equal skill and some people have a personality where they like shred, either way they arent showing off unless u specifically do it to show off.
newways thats all
peace