Yeah, I guess it could be messy, and there may well be a transfer, maybe two. The messiest scenario would be if Buchner won the job, and then Pyne and Clark both transferred. Which could happen. Buchner is really good and he'll be here for the spring. The fact that apparently he's not playing this season at all in HS doesn't help his cause, but still, it'd be three guys trying to win the job, may the best man win.
And on a related note, when they switch to open transfer policy with no penalty which they're obviously gearing up to do, the QB position is the one position where it could get messy. Because QBs who don't win the job at their home school the way Clark or Pyne might not, the temptation to and the ease with which they could transfer could cause chaos at that one position. But of course it's ultimately a zero sum game and there's only so many starting QB spots.
In general that rule's going to help smaller programs, because there's going to be a lot of former blue-chippers at big programs that after they sit for a couple of years will transfer to lower echelon schools. More readily than they do now.