As a WCE supporter I cannot say I am a fan of the JK/Bunga re signings. IMO we need new blood and delaying that is not helping.
I'm a bit torn, both are absolute legends of the club and deserve to go out on their own terms. I think both can still contribute some pretty good footy next season as well as providing great on-field leadership. However as you said we do need to start rebuilding at some stage.
Nisbett has been pretty vocal lately about how last season was completely unacceptable, and that there has been a pretty brutal review with a lot of changes implemented. Bringing in two really good assistants in Schofield & Knights is a great first step. It seems with new voices in the coaching ranks, hopefully a new game plan, a vastly improved fitness base and the additions of Rioli, SPS, and any rookies... that we are giving it one last shot with this squad.
Then after next season we'll have a lot of retirements, freeing up salary cap space, and can hit the draft hard for a few years. Next years crop is apparently really strong. Nailing these first three picks we have this year is crucial, and preferably with 3 top midfield prospects.
We cannot afford to have another season this year however, and I personally don't think we will.