My issue with bitcoin is that it has become primarily a speculative asset. After the investment required to create a coin (equipment and electricity), it's all speculation - and there's no regulations or agencies to protect the little guys. There even seems to be at least one online group doing a pump-and-dump, which seems to be aimed at fleecing noobs.

If it had turned into an alternative currency, and had the same backing as fiat currency (i.e. pretty much everybody considers it to be 'money'), I'd have a different attitude.

On the other hand, the distributed register (blockchain) is what's needed for any new alternative currencies, so that's step one done.