I think this will be dumped hard on the Dec 28th like the famous phrase "buy rumors, sell on news". 
You'd be retard if you do that. Everybody knows the potential that Iconomi has, the current trend is up.
I think he could be right. Moneywise, there won't be much to show 28 December or the days/weeks after. There will be much to show in a few months though... but definitely not right at or after the launch.
you saying we ought to dump this time so that we can buy cheap ICN on 28th?
doesn't sound right either to me. one sure route is to buy more.
I would say, go with your own feeling. If you are selling at peak prices to take fast profit, you won't help the project.. If you believe in the project, you should hold, even when the prices could/would go down.