I think they're looking at it the same way the Cowboys are looking at Romo. If Prescott continues to improve, they aren't going to want to go back to Romo when he gets healthy. What is the point? If they know Prescott is their future and he's performing well already, putting Romo back in for 6 games this season and MAYBE one more is just stalling the future. If Ware wasn't producing at such a ridiculously efficient clip, then of course they'd want Charles back. But Ware is playing awesomely. And he's obviously in their future plans. Reid would never say it, but if Charles would have a setback at practice and miss the season, Reid wouldn't miss an hour of sleep. It would just make coaching easier for him. Less headaches and loyalty obligations.
Don't get me wrong. They'd love to have 26 year-old Charles back. Without two knee surgeries. But I don't think anyone in their right mind thinks that player is ever returning.