Ethereum doesn't have a valid consensus mechanism yet, so nobody can even guess as to it's future. Before even addressing the other coins, you have to first acknowledge that scaling is important. A cryptocurrency is basically useless if it requires off-chain transactions to function, especially a 2.0 platform that's supposed to do much more than Bitcoin like operate exchanges.
Out of that list, Bitshares has the best scaling due to DPoS. NXT, if it ever gets transparent forging working, would have less TPS and slower block times, but better than other coins except Bitshares. Transparent forging is kind of like recreating DPoS in a more Rube Goldberg approach:
For standard proof of stake, the end game stake scenario results in people having to pool or lease their stake, otherwise there's no point to stake at all. They're delegating their vote power to determine the longest chain to the pool owner. The act of doing so results in two things. First, you've recreated the centralization of PoW pool mining, where most of the blocks are being validated by a handful of people and one out of million being done by some random guy. Secondly, you've also recreated DPoS, just a less efficient, less decentralized way of doing so. Most blocks being signed by a few pools vs larger number of block validators in DPoS.
Due to this, I would say Bitshares has highest chance of success, followed by NXT out of the list.