Maybe, but maybe they would have other tools, better tools, built by the people his behaviour, and the behaviour of people like him, have driven from the industry before they got a chance to have the impact that people like him seem to assume is a right.
They ware free to develop whatever they want.
If they do not wish to be a part of the GNU project that is fine, make your own project and develop whatever you want.
If people out there were willing to put in the years to create better software than what the GNU project provides than they would have done so.
And a lot of great free software has been created outside of GNU.
It is like saying that unless you get commit rights to the Linux kernel, or if you didn't partake in Linux development you could not write software. Maybe Linus called you an idiot.
Your argument is that if Linux hadnt written the kernel we would have had a better operating system today.
Being a part of a project is not a right, it is a privilege.
Writing free software is something anyone can do, and they can do it a lot better because of GNU/Linux. Just do it.