Nike admits it. Watch the documentary student athlete. But you have to be careful about what you are saying is dirty. Shoe companies aren't prohibited from trying to push kids to certain schools. Nor are they prohibited from talking to coaches about recruits. In fact, they can even have the parents of kids on their payroll, see Marvin Bagley.
And no, it won't impact potential recruits. Remember, players are the ones getting screwed by the NCAA. There is no reason why they shouldn't be able to get endorsements etc.
You also have to realize that there has been nothing shown in court that shows Self knew of any payments to players. 1) the say Preston got paid but Self and KU never played him. 2) testimony is that all he paid DeSousa's guardian was $2500 to help pay for HS classes and the guardian denies this saying he didn't get any money, 3) testimony several times that the coaches didn't know anything. The defense in their cross presented the texts as evidence Self knew. Gassnola said that is not what the texts show. He testified that they regularly talk about recruits. This is how you get recruits. He stated again, no coaches knew of the payments. They were hidden from the coaches.