Alternative path?

This question recently popped into my mind (I think it did before, but guess I didn't really answer it): what would happen if I were to leave my current job. No, I'm not considering leaving lah, just a thought. I mean, what if 1 day God decides to take me away from it? Probably prompted by my recent promotion.

What can I do after this job? Somehow, I see no other alternative than to serve in full time ministry. No, it's not like ministry is like a "backup" plan, but I think if that really happens (i.e. leave my current career), it is God who is calling me to do so. In the first place, He put me in this current career! So when it's time, He will start closing the doors on me in this area just like when He opened all the doors for me to step into my current job.

The question is, will I recognise it. And secondly, will I obey. I hope that I won't be too wishy washy about it when the time comes.