In short. I would advocate passionately towards him doing an MBA.
I started an MBA in 2004 (part time IEMBA in Smurfit). At the time, I had recently been appointed a chemical plant manager (background chemical engineering) and saw the MBA as a way to move successively up the corporate ladder.........so far, so predictable
What actually happened is that the MBA and more importantly the interaction with sharp, experienced people from all walks of business opened my eyes to what was possible outside of the narrow confines of what I had previously considered.
I started to look at areas where I thought my existing and newly learned skills could be applied in other, higher growth sectors and mapped out what I could do to maximise my return for the effort of the MBA.
When I finished the MBA, I had a number of options in front of me, and the most appealing was to start a business. Long story short, I quit my role in the chemical firm and set up a healthcare technology company, and haven't looked back.
I bounce into the office every day.
Not saying this is everyone's cup of tea, but the options in front of me just exploded while I was doing the MBA.
Caveat is that you need to make everything happen yourself. Nobody is going to tap you on the shoulder to transform your career - you need to pilot the change yourself. There are lots of people who have done MBA's whose career has not changed - these are invariably people who trundled along in the MBA and have since waited for the change to come along rather than forcing it through themselves