With another season like the last Schwarber is probably approaching a similar value to Hosmer/Smoak even if you just view him as a LF/1B only. They were both top 15 prospects in BA's top 100. Smoak plus a 24 year old 2B in AA, and a former first round pitcher who was Texas' 17th best prospect netted a 31 year old Cliff Lee. If we assume Bryant is the answer in LF which appears to be where this is going, that Schwarber isn't a C and that Rizzo is healthy/good then people really should be fine with losing him. He's almost assuredly going to be the big piece in a trade to net pitching. And if you consider the fact most people wanted pitching instead of him to begin with it's turned into a far safer way of acquiring said pitching.
For example, if we look at the best pitchers from the draft you had Aiken who just had TJ. You also had Hoffman who had it prior to the draft. You have Kolek who's at least 3 seasons away. You have Rodon who's probably a year away and likely who'd have been the safest choice. Nola is also pretty safe but lacks some upside. Same can be said with Freeland. That's not to say that either is bad but they are probably more #3/4's than #1's. There's number of pitching heavy teams that lack long term 1B solutions. The Rays, Rockies, M's, Marlins, and Pirates all have looming questions there. He'd also be able to DH nicely for AL teams. Even if all you get is a solid #2 out of him given the issues the above guys have already had that's not bad when you also consider he allowed you to over slot Cease and Sands.