I have a tough time seeing Wagner stay for all 4years. He had significant interest from European clubs last year and made great strides in his game this year.
European clubs will make interesting offers to him again this summer. Last summer he rebuffed the offers because he wanted more experience with the North American game. I would think he would hold true to that again this summer --- although the $ offered will likely be more significant.
If Wagner becomes more consistent next season, especially on defense and battling on the glass, it would be improbable to see him turn down the NBA draft in '18 (knowing a big contract in Europe would be waiting as a fall-back).
Wilson, I think we'll see in the Maize-and-Blue for 2 more seasons......but the threat makes it all the more important to develop Teske, Davis, and Livers.