I would say about the same chance as training for any other career only to find that technology has made the job redundant. The fact is that technology is great - when it works 100%! when it doesn't work then there is a problem to deal with and often it needs a human to think things through and resolve the issue. Another thought to factor in is passenger confidence. If there is no human ready to overide defective systems in the pointy end then I for one will be taking the bus!
Pass me the crystal ball and I will make a more accurate prediction for you!