Everybody can make a startup. It's all about how quickly the bad ideas stop hurting the economy. Easy in, easy out is the key. If you want to stick around, perform a service that's actually needed and when it's not needed anymore, go do something else.
Another important factor is to not get too attached to any particular job. Things are going to shift, going to change. You're not a bad person because you specialized in buggy whips just before Henry Ford put out the Model T.