Well, it pretty much is, isn't it? At least as "Popular Music" goes?
And as far as "timelessness" goes, once you remove the aura of nostalgia (or if you prefer, the telling of tales of a certain lifestyle/mindset that is becoming increasingly irrelevant), the number of "Great American Songbook" material that really holds up as "great music" shrinks to a relatively small quantity. The rest of it is, when you come right down to it, Pop Music of a different day. The craftsmanship of the melodies and lyrics is to be admired, no doubt, but somebody tell me why/how "Lady Be Good", to pick one at random, should be viewed as anything other than an artifact of a day and time long since passed.
Which is not to say that some great renditions have been offered, or that appreciation of these renditions and songs is inappropriate (appreciation is never inappropriate), but really, what the hell "meaning" does it have apart from its history? It's a pop song, period. Part of a legacy, sure, but what good is a legacy that survies on congratulating itself rather than evolving?
Let the hacks have it, and let the lemmings consume it. The sooner they all go over the cliff, the better. Since they're not part of the solution, they must be part of the problem. Or something like that...