To the "Let's just keep him another year if we can't get a good return crowd" the March 19th/3rd league day line in the sand doesn't just affect our 2021 cap. If he's not traded by then it means we also are locked into a 2022 cap hit (even if he's traded after March 19th):
the contract structure means that it is not simple to just keep him on the roster. On the third day of the 2021 league year, $15 million of Wentz’s base salary for 2022 becomes guaranteed....therefore, Philadelphia needs to decide whether they want to lock themselves into paying Wentz a least $15 million in 2022.
Trading him before March 19th gets every penny of Wentz' contract off the books this cap year and they can move on, free and clear, in 2022 when they will also be free of the dead weight from the Alshon and Malik Jackson contracts (they are both going to be cut) and some others that are coming off or will also be gone (like Ertz, DJax and maybe even Graham.) It makes no sense to be in a "rebuild" mode this year and do things like restructure aging vets to kick the cap can down the road just so you can hang more money from Wentz around your neck, all of which will affect the 2022 cap. 2021 is the purge. It's the ugly, you-feel-nauseous-but-know-you-have-to-puke-before-you-can-start-to-feel-better season.
Also, this is past the point of "just bring him back."
He doesn't want to be back and he won't come back. If there were any chance he was open to it, the new coaching staff would have been that opportunity. It's no coincidence that the trade talks started heating up when they did. He's obviously made it clear that the new coach didn't change anything for him so the team is now trying to get what they can for him.
If anyone thinks it's tough in this town already, imagine Wentz coming back after all of this?? The circus it would be, the pressure, the scrutiny, etc. He doesn't want that (and no one would.) So I don't have any doubt that he would threaten to sit out, and actually do it if the team called his bluff. He's not going to want to risk his already injury prone body playing for a team he thinks wronged him and that he doesn't want to play for, even if it means losing money (in holdout fines.) And his agent also wouldn't let him come back and risk it, either. If he is able to turn things around there's at least one more decent contract in his future.
Remember the whole discussion in the 2020 thread late in that disaster of a season about a "0% chance" to win a game not being the same as "some chance" to win. This is past the point of no return. There is a 0% chance Wentz plays another snap for this team. It's the Charles Barkley-Eric Lindros-Scott Rolen trifecta: we're going to get way less than fair value like Barkley, because the team fractured the relationship like Lindros, and the player is miserable playing here like Rolen.