I mean there are players with Barr's skill set still available, be it on the market or in the draft where we're picking. Justin Houston is out there, Ansah is a potential fit, Dee Ford potentially via trade, a bunch of guys like Allen and Williams available in the draft, etc. Like, it's not that it doesn't suck losing out on Barr but it's hardly the end of the world. It's also money that could potentially be used as sweetener for Bell and/or Paradis. I'd rather have no Barr and one of those two (or both) than Barr, personally.
There's also the point of Barr being given big bucks to play a role he hasn't in the NFL. While the evidence and his past suggests he should be able to handle it, it was a bit of a gamble.