Unless Wang has a breakout year, he will probably not be drafted given his lack of experience. Casparius and Willis won't be either - MLB teams are going to want to see how they do in a full year of starting before picking him. Wurster will almost certainly be drafted, and based on how he has pitched in his collegiate career I don't see any way he comes back. We will see on Dunlop, Krauth, and Simeone. Love all these kids to death and all of them have the talent, but I expect several of them to be back next year to serve as the staff's foundation. Not a sure thing, though.
The incoming recruiting class is loaded on pitching. Ziegler is arguably the best pitching prospect in Canada, Siravo throws 93 and is even more highly rated than Crawford was (meaning MLB draft is a concern), and we have other guys that ranked in the top 500 / 1000 as well. Between them, Lucas, Crawford, and the transfers, I am confident in the young core of next year's bunch with how well MacDonald develops pitching.
Again though, admittedly nothing is a sure thing...not with all the variables in play.