I couldn't care less about these calculations. I care about the idea NXT represents and that would make NXT a success or not.
Either you want to present NXT as a rich guy's club with some kind of superior technology or you want to present NXT as a network/ movement for free people, for decentralization and against all power government.
Sorry for the spoiler. Before u continue this discussion u'd better to know that PoS is required only during
bootstrapping phase of Nxt. I can't reveal details now, u have to wait for the 3rd part of the plan.