You can't take a dying project, sprinkle it with the magic pixie dust of "open source," and have everything magically work out. - Jamie Zawinski

These people also tended to pretend to care deeply about the blind and otherwise disabled. I am sympathetic to the needs of those users, but I can't help but think that those who claimed to speak for the blind were being more than a little disingenuous, just like those Hemp people who present their arguments in terms of their deep and abiding care for the textile industry, when their real motives are … something else entirely.

Your "use case" should be, there's a 22 year old college student living in the dorms. How will this software get him laid?

If you want to do something that's going to change the world, build software that people want to use instead of software that managers want to buy.