It's been discussed a dozen times, but i can't find an official answer to this in regards to year 2. So here goes (lets try and keep this thread civil):
Will optional matchmaking be available on all end game content post TKK?
I can't see any reason for it not to be there already and no one has presented a compelling argument against it. Hell, Bungie's own rhetoric boils down to "we don't think players should be able to do that", usually followed up with "there are LFG sites you can use to find fireteams". Which is confusing because accepting the need for LFG sites to match make games is the same as admitting that built in matchmaking is a required, and missing, feature.
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Also, the link in this post is a very well written and argued discussion for the need for matchmaking. It articulates all my own thoughts on the matter much more eloquently than I could.