All reports say that the eagles are VERY impressed with Sudfeld. also, think about how the eagles don't have a 2nd, 3rd or 7th round pick. I can see, if they get offered something stupid for foles (a la Bradford) they could trade him and let Sudfeld be the 2. Regarding Wentz, with the news coming out that he tore his LCL as well as his ACL, everything I've read says while he could be ready for week 1, he'll essentially be a pocket QB for the first half of the season at least, IF he's even ready at all. and if there's one thing we learned with this super bowl it's that Foles didn't win the game, Pederson did. The last 2 weeks of the regular season foles looked like crap because they were still trying to run the O as if Wentz were in there. During the wild card weekend bye, they tweaked the O to Foles and look what happened. Add the SIGNIFICANT losses the eagles had during the year (hicks/peters/sproles/Sturgis/Maragos/wentz) and Pederson is clearly the most valuable piece to this team (in my opinion). I say that to really say I have faith that Pederson can go out and get another backup if they don't want to use Sudfeld, and be absolutely fine.
However.... try this on for size. Foles could retire. Think about it, he almost hung 'em up before he came to the eagles. He has made it clear that he wants to become a preacher. and he ALWAYS talks about his wife and little girl. Dude is a family man that plays football, not a football player with a family. Plus he's almost 30. I wouldn't be surprised to see him pull a ray lewis. and retire on top to be a family man and preacher.