If we ignore all the 'tards and trolls - this is essentially the main downside to NXT. Each time NXT goes through a rebound the whales start dumping as per typical pump and dump cycles (price rebounds are considered the only time you can dump without potentially killing off the coin). Considering the number of NXT whales it could take year(s) to clear their holdings and to grow capitalization.
Things are further complicated by the asset exchange where there's a lot of huge capitalization assets (100+ million NXT) which if their volume were to skyrocket then in essence more whales are created and it only adds to the time it'll take to clear the whales.
Well there are too many of those in pretty much every coin. That's a downside to the whole crypto scene, and there isn't much that can be done.
If we take in consideration the recent hack that NXT pretty much survived nicely, one would think that is it quite stable.
Even though I do not like NXT that much it has proven to be a solid coin. Let's see how much it shall recover in the upcoming days. BTSX just got a minor 'pump' and is ahead.