I think moving Letang brings back a better return than some people seem to expect, and forces us to get away from building the blueline around a guy who misses as much time as Letang does and has such wildly inconsistent play.
Schultz might not be a cornerstone type, franchise d-man, but I don't think we necessarily need one to be successful either. A blueline by committee worked, even with dumpster fires like Streit and Hainsey, and guys playing well above their capability. Maatta was pretty godawful for long stretches, Cole was struggling in a more prominent role, Schultz was banged up, etc.
I just don't think Letang is as important to this team as many others do. You swap him out, hypothetically, for a guy like Trouba and I don't think we miss a beat really. Sure, on their best days Letang is much better than Trouba, but Letang's best days are few and far between, and he's been a lock for missing significant time his entire career. The guy's not doing anything to help us win games when he's playing awful hockey or in the press box. /shrug
No idea who I'd trade him to, I don't have a great pulse on other teams around the league, their assets/needs, etc. But I'd be shocked if we didn't get a pretty great return for him, and honestly, if JR found one, I'd hope he pulled the trigger. Again, just to reiterate, I am not advocating giving him away for scraps, but if we were to find a return of a good roster player, good prospect and a 1st, I'd seriously think about it depending on who the returning assets were.