Sometimes, I wonder if it was a good decision for him to go to college. It was good for him to get away from the pressure, but he got fat and picked up some bad habits (drinking, partying, junk food, video games etc.)
If he wasn't born into a tennis family, I think he would probably be doing something else.
That's definitely a good question to ask, but the other side of the coin is that he might have burned himself out on tennis had he not gone to college and gotten some new experiences. The way he says it, he'll basically acknowledge that his tennis suffered a bit, but that it also allowed tennis to be fun for him again. My brother and I have this argument sometimes. He thinks college tennis is a complete waste of time; I tend to think it's the better decision for guys who aren't just absolutely 100% ready for the pros (Andre Agassi, Michael Chang, and Pete Sampras clearly made the correct decision in not going to college).
At the same time, I think Steve Johnson was stupid to stay his last year. If you win the NCAAs and you want to pursue a pro career, then leave.