NEM is much more scalable than ETH, maybe it will finally come out to shine, though Ardor is the chief competition for ETH being that people are already issuing tokens on that platform. All the NXT based solutions seem to be fairly robust, like NEM. Then there's the blockchain trimming technology in Pascal which seems to be getting little attention.
Blockchain trimming (Pascal Coin) and child chains (Ardor) seem to be the main competition when it comes to scalability, and NEM with Mijin whenever that gets rolling. Ardor, NEM, and Pascal were all written from scratch.
Having ETH pop presents it's own problems though from a technical standpoint. Hopefully the market can work through them as it's in all our best interests to not have the.. cough.. bubble pop here.. cough.
Disclosure: Long all 3 of these. Also Ark who the poster below me seems to own.
Have any of those networks had a stress test? Ardor, Nem or Pascal? I don't think I seen any testing done on these coins. Bitshares however has tested their max TPS and you can see the test running live. Although, BTS doesn't do smart contracts. So there is that...
I think the DPOS coins will do well with scaling, Lisk and Ark are two that I know of. I'm sure there are others out there as well.
Maybe its time for Ethereum to go DPOS until they figure out something better.