The ability to enforce and sanction will hinge on the evidence, or lack thereof. We can all cry about it, but very often the guilty go unpunished not because they are LESS guilty than others, but because collecting real evidence is usually very difficult. In this scandal, the power of the FBI to subpoena and interview witnesses under oath has been very helpful to the NCAA. But it still could not turn over every rock. Additionally, the FBI never pursued NCAA rules violations, unless they also happened to involve federal fraud.
As I have said before, the NCAA is a collective organization of all of the Universities, and until these member Institutions have a real desire to be honest and play by the rules, this will continue to be a fiasco. It will take University Presidents (and Athletic Departments) firing and/or refusing to hire certain coaches, before this problem will get better. They can change the rules a thousand ways, and unethical people will still do whatever it takes outside of those rules to gain an advantage.
It is my opinion that the NCAA will not do nearly as much as we would hope, but that they will do what they can with the evidence they can collect.
With that said and from what I have gathered, I expect Arizona, USCw, Kansas, & Louisville to receive letters of allegations. NC State already got theirs.
Oregon, LSU, Creighton, Auburn, Miami & OK State could follow, but it sounds like the hard evidence might not be there yet on those schools.
It is my opinion that Arizona, Auburn and LSU should have already handled their issues internally. Pearl should have been on probation with the Admin & AD the day he arrived, and been removed as soon as Chuck Persons plead guilty… but this is Auburn we are talking about! Wade should have been fired for simply the way he talked about a student athlete and his family on the tape, never mind the fact that he was probably arranging payments himself. Miller was a no-brainer with the evidence they have on him. It boggles my mind that he still has a job.