I think some of the coins that will last for the long term will be platform coins and privacy coins. there are a number of recent listings of platform coins that you can look to invest into, but above 10m, one of my favorite gems around the quoted marketcap is Phore, just achieved everything in 2018 Q1 roadmap.some of the outstanding milestones for Q1: web and android wallet, new website, masternode setup automation and rollout of decentralized marketplace.
when you look at phore, you anchor your potential marketcap alongside the likes of other privacy coins like monero for instance. You can find the announcment thread here,
https://bitcointalk.org/index.php?topic=3179265.0