You were given the answer many times in this thread. Look it up yourself. There is no definite percentage as accounts will continue to grow. All we need that at least some big holders (more than 300K nxt) forge, as they get to forge almost all blocks anyway, they need to be honest with no shenanigans, and provide enough bandwidth. Since they have big investment, it's in their self interest to do that.
Nxt survives just by that.
As I said, I'll send you 150 Nxt to show me anywhere besides the two posts above and the one from James from yesterday
where someone answered the question directly to me with an actual non-vague and/or dismissive answer. But as usual asking a valid technical question is trolling. I will be logging off permanently soon but had to respond to the FUD you threw out about me. (When people stop talking shit about me I'll stop coming here.) Despite what you've said about me, the only thing i've been told repeatedly is that I'm pest for asking too many questions (yet emule is being courted over to nxtforum.org)
Self-Interest is also Bitcoin's defense regarding 51% attacks, yet the pooling phenomenon has made this argument more specious.
A malicious agent could pose as a benevolent pool and accumulate enough mining power to take Bitcoin down. Likely? not really. Posible?
Definitely.
If i'm a huge business do I want to invest building all or part of my infrastructure around a technology that requires 50% of all stake-holders to run a computer program on their computer 24/7? Is that a mathematically feasible expectation? Is this why BCNext said Nxt will collapse if people don't "cooperate"?
These seem like really reasonable questions to me that I'd think anyone who is trying to get people to invest money in something would be happy to answer. Here it's all evasiveness and name-calling. It's really fishy.