Any guesses what will happen when it re-opens? Going to be a lot of coins mined looking to sell...
Couple guesses. If MNs work like they should (and I've got every confidence will) then you'll likely see the price increase. Those who are short a few thousand or few hundred thousand will look and see the ROI (probably being in the triple digits for a short time) and think "it's OK to overpay for the 20K I need so I can get that ROI on the other 98% of the coins I already own". That would likely drive the price above what it's intrinsic value is (and what THAT is, is very hard to quantify). With an increase in price, you'd get a few more sellers and probably hit an equilibrium then you'd see some profit takers sell off and a back and forth activity.
The other guess is MN won't be quite as stable as we hope, in which case the price would likely fall as some of the value is dependent on the idea MN work. So anything short of a stable MN product might shake the confidence of the market.
Medium term, I'd guess that as long as a MN is less than $5000 (and are stable and reasonably straightforward to set up) and the ROI is in the high double digits, you'll see a decent amount of movement into the coin in the markets buying to field MNs. Then if the price exceeds $10,000, I'd wager the preponderance of new nodes would be miners/MN Owners invested versus people buying in. But it all will depend on the ROI (and to some extent how stable crypto as a whole is over the next three to six months).
Personally, my plan is to reinvest my mined/MN'd coins into additional MN's as I can, because I think the coin has a long future ahead of it. The price per coin would have to be pretty high for me to start taking much off the table and not just reinvesting. And really, that's kind of my impression of what happened with DASH's early adopters. They ran a MN, saved the proceeds, the price went up, they bought another, the price went up and eventually they started selling when the price got above their magic price point of it being "really high".
I would wager that most of the coins that hit the market will be from the Orphan Fund and any other expenses that need to be paid in non-BBP, with miners probably supplying most the rest. But that's just all a guess.