Sia, and Ethereum.
1. They have 1 clear goal each. Sia for TRUE decentralized storage, and Ethereum for TRUE decentralized virtual machine. Both have achieved their goals already.
2. Solid development teams. Go look at their commit history; go look at their writeups; go talk with them on their Slack. Real.
I will not be surprised to see more Ethereum chains starting up in the future, just for the sake of having smaller chains. Ethereum itself is going to reach $1000 per coin one day, you can guarantee it. The technology is next-level.
Sia is the best, most efficient and truest to decentralized storage. Already there are a couple companies that have their backends hooked up to the Sia network. Sia is young and still surprised it is at the price it is at (1 cent per coin). I guess I shouldn't be though. There are something like 23 billion coins.
If you hold 5 million Sia, you will be a millionaire once it hits 25 cents.
10 million Sia, only needs to hit 12 cents.
I'm not sure why "Waves" is suggested. I have looked into it but not extensively - doesn't look like a good technology.
I'm on the lookout for other revolutionary techs like these. So far nothing, but that may be because they cover the 2 important aspects of computers: storage and computation. What else could you make that can't be generalized to these?
Of course there is Bitcoin for currency, but we already know it's going to keep rising
The important question to ask is, are we missing anything? storage, computation, currency...Even then, 'currency' logic can be generalized to computation (Ethereum), which surprise, already has a
ton of coins built on top of it.
Maybe we need to differentiate between long and short term storage, and computation?
I think coloredcoins/ERC20/Bitcoin 2.0 tokens are going to become the next surge of investing. I am even creating my own coloredcoin for my information service, as a way to generate investors but give something back - tokens that allow them to have lifetime access to my service. These tokens can be traded amongst users for whatever price they see fit. If I sell for an initial $100 a coin, I can see them trading for $200, since there will be a limited supply. If you don't have a special token, you have to pay $10 a month (in any cryptocurrency you want though) to access the service (which is more than fair).
What I'm saying is, maybe you, or we, should stop looking at altcoins and look at colored/ERC20 coins now. Or not...10 years is a long time.