NEM is quite advanced in features, and it's one of the fastest cryptocurrencies to date. While it's still under the radar of many investors, NEM has been progressing in development and innovation at a slow pace. With the implementation of the Catapult scalability layer, you could expect for NEM to increase in transaction throughput like never before and become more flexible for micropayments.
Of course, this altcoin has been having a hard time increasing in value after its ATH, but I believe that in the future, it'll become much more valuable than what it is right now. Considering the development team behind it, and a dedicated community, NEM will be one of those altcoins that will survive in the future for sure.
Lastly, another altcoin that will survive in the future would be Litecoin. This is simply because, it's been tried and tested over the years with a solid community behind it. While it's not as active in development as other leading cryptocurrencies, it has managed to stay strong since its inception. Thus, both NEM and LTC would be altcoins that you wouldn't want to miss for the long term. Just my thoughts