Yeah, but you have DC as a big player in nodal. They do a ton in the FTR market, which is basically what NEX is (there are a couple of subtle differences though).
The algo that calculates clearing prices makes my head spin with all the permutations possible.
I have my doubts about liquidity. I think hubs/zones are going to trade the most, along with some constraints that everyone knows (Bed-Bla, Clo-Lex, ect.) But its entirely possible that this thing could work.
In regards to the WH minis, there is basically one guy making a market, so if he pulls you're pretty much stuck.
Its kind of funny, there is one guy that is stuck with 25 megs of bal mo and he has his guy come across the box every morning trying to dump it. I tried to get a number out of him where he would roll out, but he wouldn't show anything.
If they offered 1 mw blocks on dailies, that would make things a little more manageable.