For all intents and purposes, that's a 737 with an efficiency tweak. It's like going from merge sort to quick sort.
Is it? It's an all-new design, using a new material for the first time, etc.
I didn't mean to be so blunt in my first reply, but there are tons of improvements that can be made in that industry, especially if you look at old problems with new eyes.
You're right, there is innovation in that industry.
And the point is: if a generalization about an industry is incorrect, it's not a good idea to use that as a logical foundation for predicting the age of entrepreneurs in that industry.
Have you heard about the Boeing 787 (http://news.bbc.co.uk/2/hi/business/6282820.stm)?