George Mason University law professors Todd Zywicki and Joshua Wright have been the leading (and almost sole) academic defenders of the current interchange fee system.

So how's this for irony:  Zywicki and Wright's own employer announced that it will no longer accept Visa for tuition payments because interchange fees are too high.  (You'll have to watch a 15-second BP propaganda bit before the video on GMU).  The school doesn't want other students or taxpayers footing the bill for rewards programs.  Antiregulatory ideology runs deep at GMU, but clearly it won't get in the way of a real world business decision.  

Note, btw, that GMU was able to opt-out of taking a particular card network (somehow the other networks are permitting a convenience fee to be tacked onto the tuition bill to cover interchange).  Universities are in a rather unique position of being able to refuse to take cards altogether.  For most merchants, taking payment cards is just part of operating in the modern commercial economy.