The thing is, we have several competing ideas of what constitutes Alpha, Beta, Early Access, et al. And what exact milestones are necessary for each of those terms.
i think for the longest time, the idea was that to come out of "alpha" to "beta" would require a working full-featured single player campaign and surely a multiplayer environment where we're no longer arguing over what constitutes cheating or not (the mods). Also, where the civ designs are rather solid and complete and the tech tree not in flux. Then with Beta, we can balance all of those things and fix anything that crops up.
That's an older view of game development, but the industry has moved on to a more "perpetual development and balancing" environment, in an odd way meeting Wildfire Games where it's at with its development of 0 A.D. So, I'd advocate we get rid of the old view and embrace where the industry and gamer expectations are at today rather than how we wish they'd be or where they were 15 years ago.
Having said that, I'd still like to tunnel down and get some things ready to go before officially boosting the game to Beta. I'd still like a single player campaign even if it's not full-featured and "complete," and I'd like to get the rest of the civs differentiated on the level of the Athenians, Romans, and Spartans are in Alpha 27. And lastly, we need to get the multiplayer community under control before we can legitimately go to Steam or wherever we can go after claiming we're in Beta or Early Access.
So, I'd say let's make Alpha 27 the final "Alpha", and after that change our mindset and goals toward the next release being "Beta 1" or whatever we decide to call it.