You've practically brought all of the exotics up to year 3 at this point. The only ones really missing are the trophies of all exotics in year 1. The [i]truly[/i] exotic guns of destiny. Vex Mythoclast and Necrochasm. I don't see a reason for it not be brought to year 3..
-
I think that if they remake the old raids you might have your wish. Maybe the vex will be upgraded with Siva & it will be the Siva Mythoclast that would be Awesome.