I think the author is a little cynical. As someone with a handful of small open source projects, I know exactly what he is talking about but I wouldn't say it'

I think the author is a little cynical. As someone with a handful of small open source projects, I know exactly what he is talking about but I wouldn't say it's driven by narcissism. It's mostly just people new to programming trying to contribute and usually learn something through the process of contributing. You can always just tell them they are free to fork your project, this may offend them but if you do it politely and explain that you do not feel like investing that much time in the project or that their changes are too complicated then they will understand.