Well, yeah, but the context here is open source apps (or is it?). No amount of enticing or forcing someone to go through garage will help with closed apps or components :-)
In the meantime I hope no one is seriously suggesting that we are supposed to stop using apps written (mainly) by one author just in case that person gets bored and goes away. Or that we should somehow force extra developers to join such projects (and the projects to accept them). Both attitudes would be borderline mental disorders IMHO.