There are still many problems in crypto:
- This year we had many HARD FORKS.
- high transaction costs ($40,- btc)
- transaction speed
- realy decentralized? Who are the big players, who decides the hard forks..
- almost all crypto needs to be payed with btc
- ICOs - to much greedy and some good projects
We arent there yet. But these problems wil be solved

Maybe in 2018..
Do you really consider "Who are the big players?" and "Who decides the hard forks?" a problem? Because I don't think these two should be considered as problems.