He's the one who actually won them the Super Bowl last year and got them into the postseason this year. Philly struggled with Wentz as the starter. They only went 5-6. With Foles they were 5-2. I'm an Eagles fan and watched a ton of their games. They were just a better team with Foles. It was almost a night and day difference, though I acknowledge that Wentz might be the more physically gifted quarterback.
Also Foles is 29 almost 30. It's not like he's an old man. He still has several good years left.