Maybe he's still in a college mindset where for him it's about the system and the players come and go.
Look here:
http://www.nfl.com/teams/statistics?team=PHI
Then look here:
http://www.nfl.com/teams/statistics?season=2013&team=PHI&seasonType=
In the first link, compare the stats between Mark Sanchez and Nick Foles. They are eerily similar. Sanchez was actually more accurate and had a higher YPA. Replacing a guy in Foles who looked like a superstar in 2013 and then slightly above replacement level in 2014. Fairly positive he feels he could plug anyone in and get results.
Now, compare the stats of DeSean Jackson in 2013 and Jeremy Maclin in 2014. They are:
Jackson in 13: 82 rec, 1332 yards, 9 TDs, 16.2 Y/C
Maclin in 14 (Coming off of ACL Surgery): 85 rec, 1315 yards, 10 TDs, 15.5 Y/C
Also consider the emergence of Jordan Matthews and Zach Ertz.
I am willing to give Chip the benefit of the doubt, he just needs someone to run the defense.
I hope it all explodes in his face, don't get me wrong.