Take a look at your network right now and while it probably has some diversity, I bet it’s tied pretty closely to what you do right now. That make sense, right? You meet people that are in the same line of work because those are the blogs you read, the events you attend.
It’s smart, but it’s only good until things change. Probably you don’t know yet what the “next” thing will be, but maybe you at least have an idea or two. Maybe it’s about location and you need to focus more on meeting people in Orlando or Dallas or Phoenix. Maybe it’s to leave the comforts and confines of being an employee to be a consultant so you start networking with consultants and following consulting companies.
It’s harder I think, and the return is even less sure than the leap of faith effort that your current networking takes. It’s never going to be a loss though. At worst you’ve grown your network and that’s always worth doing.