One of the great things about open-source, is when you discover a weakness in some tool you like, you can modify that tool and submit a patch. Or you can learn from the source of one tool and add another tool to the marketplace. When the marketplace is saturated, patching or modifying the popular tools is preferable to me.

Also, I would prefer developers spend more time making general applications and less time making tools for other developers. I'm not saying people shouldn't make great dev tools, I'm saying more people should make great applications, and less people should make great dev tools.