There comes a time when one has to stop doing the things one was doing for along time. It is hard to do that... Sometime it feels it is impossible.. Some people lack courage to do that, some people lack motivation and for some people situation don't let them..
Once the decision is taken, is it possible to revert that decision.. Yes.. I think it is possible to that. Question is what it the cost of reverting the decision. I don't think it is much..