I feel your pain, monkii. We certainly need a wider variety of protagonists in games, of all varieties. It'd be great if we could have that here. Having said that, I personally wouldn't be too disappointed if it didn't happen.
Casey hasn't revealed very much about the premise or story of the game, or indeed if he's worked it out in any detail or not. All we know is the genre that it's in, plus an idea of the art style. We don't even know if the hero has a name or not.
If the game has a story (and I want to stress once again that we don't know if this is the case or not), then IMO it may be difficult to allow multiple protagonists. The few single-player games which have a story and allow this (the Fable series springs to mind) have their stories carefully written so that it all hangs together.
Also bear in mind that this game doesn't have a budget that we're aware of, so more graphics means Casey's wallet is correspondingly lighter. Casey is too nice to say this, but assuming that it fits with the premise of the game, sending some money his way might be one way that it could happen.
Hell, we've only got placeholder graphics at the moment; it might not be too late for the protagonist just to be female with no male option...?