FWIW...
Over that span, the team has scored 2 or fewer runs in 26 of those games and has been outscored 296-155.
It would take two more Shelby Millers or Maddux, Glavine, and Smoltz in the rotation to make this team competitive with the lack of offense, so (like him or not) it's not completely Fredi's fault. I think the obvious statement Hart & Company have made with the extension is that bringing in another Manager wouldn't make much of a difference. There's little reason to bring in one of those "master tacticians" until you've developed enough pitching to keep you in games when you're being built on pitching and defense - there aren't many chances for Manager's decisions to have any effect on the games. In general, he is running the correct side of the platoons out there against the right Pitchers (Castro instead of Peterson, Bethancourt instead of A. J., Garcia against Matz last night for example). Beyond that, there's not much he can do - he's not got a bat in his hands, and he's not the one who still can't learn to stay out of the middle of the plate and stop grooving pitches. The players kinda have to make those adjustments themselves when they've been embarassed enough.
Much like before, I'm not saying Fredi's good (by any stretch) - just that until there are a couple more signings, development from Peterson/Wisler/Folty/etc., and some of the talent that's been acquired gets closer - changing Managers seems pretty pointless unless he actually HAS lost the clubhouse. Whispers to a reporter without names and specifics attached don't qualify as evidence - for all we know Bethancourt might've been the "source", and he's just *issed (and rightly so IMO) because he's not getting to play enough.