That's an awful lot to give up to get Trouba + in return

Not sure how this solves anything for WPG. Their issue is they can only protect 3 Defensemen in the expansion draft. So by making this move, they're still in the same spot, and would basically lose Fowler next year. No reason for them to make this move.

Over value Fowler much? Nyquist+Smith+Pulkkinen for Fowler, First off Anaheim can't afford all that cap once Lindholm and Rakell resign. And i seriously doubt that Winnipeg would've any interest in a Fowler for Trouba swap any ways.

RedWing56 nailed it.
Overpayment (and I'm a Ducks fan)
Too much cap

Something closer to Tatar and Pulkkinen/Jurco for Fowler and a pick is more plausible