It was a big pool, now its a big pool, always be a big pool with all NxT in it ;-)
If you zoom out far enough

, every decentral system becomes centralized by it self ;-)
I think making available unrestricted forging without password phrase sharing will make NXT ProofOfBuy-RegisterKeyOnceAtMegaServer-DoNothingToTheNetwork-GetProfit
yhea, this is possible indeed.
That's the reason I was mentioning to set maxNumberOfAllowedForgingClients != infinite.
This would lead to an minimum dispersion, affected by the value of maxNumberOfAllowedForgingClients.