Problems with the time for processing a single transaction, and sometimes even a complete denial of the service of small transfers made the investors look for an alternative. As a result, the capitalization of individual crypto-currencies has increased several times. At least 3 crypto-currencies today have high chances and real tools to outstrip bitcoin by capitalization in 2018.
We need coin for micro transactions and bitcoin isn't one any more. Hopefully lightning network should this solve problem...
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1.Ethereum
Will face the same thing, high fees - slow transactions.Quote
2.Ripple
Bankers coin. Don't like it, won't use it and won't support it.Quote
3.Stellar
Now this is something which I have been watching lately, I honestly think among all altcoins stellar has biggest potential but it is far away from replacing bitcoin.