I think it would have been "our year" if the team we saw at the beginning of the season could have played in the playoffs with a healthy Perkins or JO.
In other words, it wasn't really the trade that derailed our status as the "favorite"; it was age and injuries.
You speak of age and injuries as if they suddenly popped up at the end of the season. Almost all of Danny's Defenders do this. Age (and injuries are related to that) was ALWAYS our achilles heel. But we were designed to overcome that, until The Trade (and related deals) sent away our defensive anchor and wrecked our cohesion. Yeah, then we became just old.
Do you really claim not to comprehend at all that the Celtics' remarkable focus and cohesion, that extra gear of mutual trust and understanding that they could get to and that no one else could, was the x factor that amplified experience and overcame age?
As someone else noted, what Ainge did with The Trade contradicted everything else he had so painstakingly done, to the point where it almost seemed like he was thinking like someone running a fantasy team. His thinking seemed to be along the lines of "gee, Perk doesn't give us that many stats, and Green has pretty good stats, so we can just unplug Perk, and a whole lot of other people too, and then plug in all these new people, and IT'LL BE GREAT!" It was, frankly, moronic at best.