yeah definetly, people should definetly take some risks sometimes because if you don't you'll just end up being an agoraphobe.I'm not sure I understand what you are saying here... Lots of pros (myself included) have to play in as many bands and situations that we can handle. At the risk of generalizing, I think that there might be a lot more pros who have multiple projects, than those who are fortunate enough to have plenty of work with one project.
I'm with frank0072; it just kinda happens. Whether or not you choose to run with it becomes the 'decision'. life shouldn't be without risk ;-) Personal choices will set the paths we travel.