Sounds like a good idea, but i will tell you in this business you have to find quality people and retain them. This is not a business that you can hire people and expect them to produce quality work without your constant presence and quality control. Of all the guys i have hired over the years i would say it takes a year to turn a tech into someone you know and can trust to produce work at a quality level you would expect and can trust. I am in the diesel business so this may be a bit different we do mainly major repair and diagnosis, while i feel its rewarding you have to watch your guys to make sure you are getting accurate diagnosis on problems, no one wants a 3k bill and still have the same problem.
Like Joe said most of us came from the shop to the owner and its not easy, i would suggest finding that guy that is having some growing pains running his business due to he knows how to run the shop but struggles with running the business, that's your guy he already wants the place to be successful but is struggling with the business side. Buy him out and let him run the shop, I know there was i time when i would have gone for that. There are still days i would love to just go out in the shop and work on a truck and get left alone, those days are long gone as the owner.
Good luck.