KNC just have to hold out for about 3 more weeks, make sure nothing happens that causes a mass stampede for refunds. Once they ship their first unit, there is no going back - they are millionaires. Can you imagine what it is like? If Sam or anyone is a drinker, they must be hitting the bottle big-time right now to steady the nerves!
They will sell any miners left after the pre-orders are out the door. If no one wants them at that price, they'll sell them at reduced price to shift them. They've already added a clause saying that they will continue to sell through Dec, Jan etc if other companies add lots of to the hash power to the network (which is what is happening). They aren't going to hold on to equipment that will be redundant and no one wants in 4 months time.
I wouldn't be surprised if they retire and get out of the game after that. They are obviously gamblers, but they aren't stupid. It looks like their gamble will pay off, but probably not for their customers who gave them the free loan of millions (pre-orders).
It's a funny old world.