so what the ending is saying is that the other movies are basically filler well damn
No it means T3 and Salvation and TSCC would have never happend.
I'm glad they went with the theatrical ending. The "happy ending" goes way overboard with the cheesiness -- the age makeup, the "future fashions," John becoming Mr. Smith Goes To Washington -- and would have dated a movie that's otherwise almost completely timeless.
The ambiguous ending is cool because it lets their "new" future be the one that really happened; the reality that we're living now.