I would say since the hiring at the airlines has stopped most instructors have graduated, but historically most instructors in the passed were students finishing their degree or just recently graduated. Who knows what it will be like when your son has his CFI? It could be worse, it could be better. My Sophomore year students were told that we would see hiring unlike anything ever seen before. Which we did.... about a year before anyone had the minimums (300TT and a heartbeat). Now those people don't have a choice but stick around and those graduating now, who are not hired don't have the opportunity to get hired because of lack of attrition. Either way you look at it what is currently going on today may or will not be the case 2-4 years from now.
As you probably know as a MD-11 Capt. things change just go in knowing your sons "plan" may change.