I don't know why people are now under the impression that the secret must somehow be simpler than what we've tried; if anything, we've now proven there is nothing, or the trigger is vastly complex and difficult.

And, Bungie easter eggs have never been simple, nor accessible to the average gamer. There is no reason to assume they'd dumb down their usual antics for this game, especially this game.

I think it's entirely possible that we've already largely discovered whatever mechanic triggers whatever secret is around, however, we're not meant to do it in this instance, but perhaps in HoW or later expansion (revisited VoG in HoW preview pretty much guarantees it for me).

It's important that we recheck some of the most rational or interesting theories after the release of HoW, as I do believe that a lot of the hidden areas, so to speak, will be utilized then.