I wouldn't say this isn't happening elsewhere. Look at Texas A&M, they lost a LOT of good QBs over the past few years (including Kyler Murray). This seems to be a growing trend across college football. The uptick in its occurrence at Ohio State is certainly worrying, but I think it's more a reflection of the trend in general rather than something specific to Ohio State.
The question still remains what is the best approach/strategy going forward, it's just that this is a question a lot of schools will have to wrestle with.