Not sure I totally agree -- at least in the case of a kid that's maybe going to get a call in the mid-to-late second round. I get what you're saying, but if you're actually fringy there are two things that are exceptionally important, IMO.
1.) You probably have to at least account for the fact that you may not end up with a 10-year NBA career and therefore your money is going to come from Europe and your college degree. Battle walks out of here with a degree (or at least very close to one) and still can go play in europe, which is where he was likely to end up anyway.
2.) If you're fringy, the other thing you need is a really refined skill set of one sort or another. A kid like Brogdan, for example, is having success as a really well-rounded, mature basketball player. If you're an elite athlete like Jerami Grant or MCW, then have it. The NBA will be a little more patient with you. But if not, you better walk through the doors of the arena with a polished set of skills that allows you to contribute when you're on the floor. Otherwise you're not getting much of a chance.
To be clear, if you're a kid that wants to be in the nba and you want to leave at the first whiff, go for it. I also agree that in a case like Battle's, there is a chance an extra year does little or nothing for you. But I"m simply saying there's path to a prolonged NBA career that is aided by a few years of college ball.