It's not really. Wilson isn't old for the average age of our core. And he is an exceptional athlete. It isn't even just the injuries and the fact that in 7 seasons he's only played 11 games or more once (or on average since he became a start he plays half a season) The real problem is on top of his injuries, he doesn't come back ready to go. It takes him a couple of games to get back to form. That combined with the amount of games he plays is just too much. filling in for him for half a year we can do fine, we have the guys to do that. But then taking guys who will play better out for a couple games so he can get back up to a slightly higher level is a big hit.
We walked away from Jackson Jeffcoat, with out a replacement, who was a year older, played a larger portion of the year, and was instantly an upgrade when he came back and was inserted into the line up. If he is the litmus test on when to walk away from veteran players, Kyrie has been well under that mark for a couple years.
Even if the standard is Jamarcus hardrick, it's time to move on. He was certainly older, but he had more recently started struggling to stay healthy and continue to play at a high level ending the year. He was also better as soon as he was put back into the line up than our other options.
Finally, Jones is not an outlier or young physical specimen. He's a Lunch box guy. He doesn't cover his area in pass D very well with speed, and doesn't make great decisions. He was frequently too shallow last year especially late and teams attacked his spot. Jones covers the gaps, scrapes to the ball, and tackles well.
Biggie is the clearly the real problem in the Lber core. As long as he isn't back it's not too bad. Kyrie needs to have a short leash in camp, and likely should be limited in reps if he makes the AR. He shouldn't be an every down guy even in his best form.