Would you consider the risk of compromising only 7-12 stakeholders who likely know each other and work together (thus compromising one would likely lead to compromising multiple) a secure arrangement for a currency ?
P.S....What is funny about all this is Nxt was already attacked in a fundamental way even before being released and thus has little hope of widespread adoption.
You used the word "likely" two times too much. Vague assumptions are not enough to base an attack on.
Many (anon) stakeholders have their PoS private keys in cold storage. Good luck in finding them.