Liquidity is the most important property of the cryptocurrency. Faster transactions, anonymity or lower fees hardly matter if there are no places where I can spend the currency. Or if I sell services with it, there are no customers willing to pay.

It is a huge chicken-and-egg problem, but looks like Bitcoin has solved it at least some level, since it is accepted on quite many places. We might start seeing services and merchants adopting other cryptocurrencies as well, but currently those alternatives don't seem that widely adopted.