It's not just about player value and all of that. It's also important to remember we haven't had a first round pick in a while (counting the fact that Espo was traded). It's important the organization doesn't fall into the habit of depleting it's prospect pool every season.
Pittsburgh's biggest holes are on the wing, not on d, and that's where the money should be allotted. I wouldn't want the Pens to sign Witt for that sort of money if he were a UFA, let alone give up assets for him.
Honestly, people are wanting the Pens to give up the likes of Crosby due to the cap just so they can make room for Witt?