My concern is we are solving a wrong problem from the beginning.
GNU/Linux is an OS designed by hackers for hackers(at least in my age). The target users should be admin, not end users like grandma. That's why Linux desktop is never mainstream despite our community put so much effort on the user experience (but the effort has not wasted)
Before you yell at me, on the other hand, android (shipped with Linux kernel) has a great success because it's dummy proof design. Even a 2 years old can mess around tablets by his/her own. We can invent million theories, argue and hate each other all days. But there is only one fact. The fact is that mainstream users enjoy the fruit of open source is brought by Android from tablets. Unfortunately, tablets' gui toolkit is dominated by big corps.
When do we start to put focus on gui toolkit for tablets? We did try, but far away than enough. When do we able to admit new generation use tablets way more than desktop? Seeing the open source communities keep heading the wrong direction make me sad.