The PO window was open for a little over a month (PO on 9/25/15 / Wait-list around 11/2/15) and ECC/Cinemaquette sent out notification emails that it was available to pre-order.
Between it being heavily discussed on social media, displayed at various conventions (SDCC/Monsterpalooza) and over 30 days to pre-order, I don't see how anyone could have missed this guy.
As you know, this hobby is dynamic. New people entering hobby, some collectors leaving the hobby...and then, you have people like me that collect in phases so sometimes I'm actively acquiring, other times I'm not. This is how I missed out on XM Magneto so I had to buy him in the after market.