I just don't think they have fallen shorter. They've gotten better every year. And Turner was still a top player last year, just not the MVP candidate we wish he was (he was also hurt, which is part of being so reliant on free agents of a certain age too). You can't roster-build for the post-season crapshoot, even more so these days.
Perhaps both of those things may start to change in the coming season. But not only is it difficult to move those players, the Phillies also still don't have the system (which at this point can no longer be entirely blamed on the previous regime, those '20 and '21 classes aren't looking so good, TNSAAPP caveat aside). Hopefully that changes next season as well (Crawford, Miller) but still no corner-type bats.
There are obviously similarities to the last era, but if so I think it's only 2011, not 2012. This front office hasn't traded away the future aggressively or handed out ridiculous undeserved extensions a la Howard. And I think they were wise to avoid the free agent or rental trade market this off-season (but there will still be the latter in July).
Granted, that crossroads into 2012/2013 comparisons is approaching this off-season (last time they stuck with Utley and Ruiz and Rollins, this time it's Schwarber and JT). Then as now, it all rests on the health of the top two pitchers and the 1B.
Walker is still a non-issue to me If it wasn't him it would have been Tyler Phillips. Players get injured. They have bad seasons. Doesn't always mean they are cooked. I think the hostility towards him is based on the misperception is that he wasn't good (or a good value) to begin with. (He wasn't a great one but that's the price of FAs. Ironically, unlike with the position players, the Philles turned out to have good enough internal options to replace Eflin but they didn't know it themselves).
And at the end of the day, the Phillies tried to trade both Bohm and Castellanos (two years in a row in Nick's case) and determined that not only couldn't they get anything of note for them, but it would cost them even more money and talent to replace their run production.