I'll wait till all the changes are sorted out with transparent forging and the developers publish a whitepaper before making any assumptions upon the security direction Nxt is headed.

 From reading the material and from your statements the security concerns I bring up aren't addressed from this partial implementation of transparent forging. It appears you are resigned to believe that it is near impossible to find and identify any of those 15 top stakeholders which is a bit disconcerting. Some other concerns deal with bugs creeping into Nxt that allow for an exploit of some/everyone's stake.

I still am interested from an academic perspective in the future whitepaper but not Nxt as a currency because I consider the way it was launched an attack on the credibility of the network right from the start so don't hold out much hope for Nxt itself. PoS /DPoS future I'm not so certain about.