Well, I got the impression also, the writers intentionally avoided Iris reminding Wally, that he has to come back for the wedding...instead, Iris simply asked him, "are you sure?" Before embracing him one final time. Imo...Joe's small moment with Wally was telling...Joe said, Wally has gone all these years without him in his(Joe) life...he didn't want to lose him again. I can't imagine the writers putting that in there, if Wally was going to be a permanent member of the show. At best, he may make guess appearances; but, I stress again, I got the impression they were writing him off the show. Just judging by a few other tell-tale line, the cast body language, and the actor himself did not seem pleased & distant in the 3rd season 1st three episodes....kinda remind me of the actress who played Vivian on the "Fresh Prince." Hey...just how I saw it. We will find out for sure at some point.