Without McCutchen, a CF and a much more productive Harper, Segura and Realmuto (and Hernandez) just look like decent complementary players. I certainly go all-in on this core (which Herrera and Cutch were also part of) if things are moving in the right direction (health-wise and performance-wise) but if not....
Personally I still think Kapler is doing a good job. The last 10 days to two weeks have been a disaster and if there is a collapse going on it's not because of chemistry or managing, if anything those things kept it from happening sooner. You could easily sacrifice the hitting coach right now but that never seems to actually work either.
If you want to be negative I think it's fair to ask, given Realmuto and Harper's performance as well as Franco's complete irrelevance, if they messed up not getting Machado. If Harper is never again a consistent .900 OPS player we didn't get the better guy, and if he never has another. 950 season we didn't get the MVP-level guy we wanted for the money either.