But "in his prime" doesn't mean they can't continue to improve. Sure, it won't be by leaps and bounds but the better players continue to add to their game even once their bodies start their inevitable decline. Regardless, I don't believe our pre-KD team was a true contender nor has it been since we lost to Milwaukee. But getting rid of 4 players while bringing in Durant and TJ isn't going to make us a contender either.
To me, we've dug our hole even deeper than it had been and I have no idea how we'll recover. But I thought the same was true for the New Jersey Nets when they made a deal that I thought was almost as horrible as the one we just did. And they went young after it failed and gradually built up a nice roster. Granted, they threw it all away again but at least it gives me a little hope.
Unfortunately, IMO, our best way forward probably involves divesting ourselves of everyone with much value. We can gamble another season but I suspect by the trade deadline next season, the picture will be clear.