There are only a handful of guys I would trade Jaylen for.
Doncic
Embiid
Giannis
And, yes, Durant.
Durant is younger than Curry, who was magnificent in these playoffs. And Curry, due to skill, will probably be great for another 3 years.
Durant's skill set is off the chart. His game will age well. Being able to do what he does for 3 or 4 years isn't something I am worried about. Especially when surrounded by the cast of players here who will make up for him on the defensive end.
And no one is going to beat a Jaylen Brown package for Durant.