First off, you don't know that. How many people on this forum thought Bradley Beal was going to be the player he is today? I loved him in college, but many on this forum looked at him the same way your looking at Wagner. That said, every player you draft isn't going to be a star, but they can be one more piece of the team going forward. Lastly, when you compared Kispert to Staukas, you lost all my respect. They are nothing alike. Not even close. Kispert is the best shooter in college hands down. He's also a good passer, a good defender and has high basketball IQ. But most of all, and the biggest difference is, He's one tough confident dude. Something Nik lacked. He shoots over 50% from the three on catch and shoots. He's also a SF, which is something the Kings lack.
Having said all that, yeah, I'd rather have Cunningham, Mobley or Green. Right now it looks like it would take a miracle to get one of them. So I think you have to plan for the worse, but be ready if you get lucky.