It's certainly interesting to revisit this a year later, especially to see how completely wrong the majority of us were. It seems I was off by a factor of ~9.
2.9146th/s atm
Close.
With an average difficulty this month of around 42.5 billion (averaging past, current, and predicted difficulties), and with January having 2,678,400 seconds, the hashrate necessary to generate
BTC1.0 is 2.726047 TH/s (ignoring pool variance).