I could see Kapler going if it gets really bad. Firing a few coaches doesn't really appease or help. And managers just don't get three years anymore.
Klentak's not going anywhere, he gets to hire one more manager and he and MacPhail and Middleton are in this thing together.
But as I said in another thread I think Kapler has actually done a good job. I think what he's gotten out of the bullpen has actually been good (the record, and the injuries, do not lie). And I don't think the manager can really make Bryce Harper hot, or Aaron Nola as good as he was last year. They also signed two of the most durable early 30-something players they could, and lost both of them
Before Herrera's arrest and Cutch's injury I thought a fixed bullpen and one starter would keep things going in the right direction - which they already were, i.e. the team was in first place all season, and was on pace to win 91 games as recently as a week ago. That's a good result, and another 10-game improvement over last year. If they repeat last year, collapse, and finish below .500 again, then of course things change.
But there's no reason to assume what we've seen in the past few weeks is a permanent trend. They've taken some hits on some tough road trips but have also still won plenty of games. If they go in the tank for the rest of June then they will be trouble. There's certainly an argument to be made for improving the team before the next Braves series, especially now that Neshek is gone again and there's still no sign of Robertson.
I think Klentak's biggest mistake was probably having all those older bullpen arms (Nicasio being the least-needed, though healthiest, of them). Arguably he also has too many prospects on the 40, if you're going to have a team that uses the entire 40. People keep complaining about Irvin and Suarez and Garcia or just using AAA starters as relievers in general but there is no one else on the roster. They have little choice but to trade guys off the 40 at the deadline, just to open up the space for the acquisitions.