I think this statement goes too far in the opposite direction. The Eagles fell apart this year, when GM Chip Kelly dramatically altered the roster. Chip's inability to evaluate talent is reflected in the Eagles W-L record and net points by year:
Eagles W-L record and net points by year:
2013, 10-6, 60
2014, 10-6, 74
2015, 6-9, -58
As dcm and others have pointed out,
Chip's problem wasn't his coaching, but talent evaluation. The Eagles floundered this year, when Chip was given full control of personnel. He thought a bottom third QB with multiple ACL surgeries that hadn't thrown a pass in nearly two years was worth two draft picks plus Nick Foles; he thought investing heavily in RBs (specifically Murray) was a good idea; he paid little attention to the OL.
Despite the optimism of some posters here, many of us (e.g. SN, KFP, myself) thought he made terrible moves, and predicted that the Eagles would flounder. Many in the media made similar comments. Those predictions proved prescient when the Eagles floundered in the weakest division in the NFC. Stripping Chip of his GM responsibilities is a predictable and reasonable move. The fact that Chip balked at losing such responsibilities reflects immaturity on his part, which is disconcerting.
If Chip is smart and wants to become a good HC+GM (in the NFL), he'll take a job (either as HC or OC) under a good GM and learn how to evaluate players. It will be interesting to see where he goes next.
EDIT: That reminds me...
@Kull: Sorry about the Eagles this year. We've got one more game left, but Bradford is current 25th in DVOA.