NEM's great but for whatever reason after all this time it's still pretty much invisible to the majority. This thread can go for 12 hours without a response, the Reddit sub has had one thread in a month, pretty much the only TXs are node payouts, the android wallet has had 100 downloads.
With all that in mind I don't think anyone should expect anything when it comes to price in the shortish term. I'm surprised it held up for so long. Its day will certainly come, I can't think of anything else that's as well rounded, but right now it could go down plenty further for no particular reason. If that happens then I'll pick up some more but I'll be doing it with a 5 year plus mindset.
There's not 2 non-crypto-nerd humans on this planet, within shouting distance, who know about an alternate - otherwise no one would had adopted dumb names like Ethereum or Monero. You're painting a brush on XEM which could be painted to any alternative.
Besides that Gems thing had over 100,000 downloads and today it's dead.
Clearly this shows to me NEM has fundamentally strong economics if it can be in the top 10 with a smaller user base. The other cryptos seem to be ponzi schemes which need a regular large flow of new users or they burn out. This is expected when all the coins utilize inflation to enrich their founder oligarchs.