Regarding this proposal: Crypto-currencies
Cryptocurrencies are NOT that generic. Yes, most of them are ridiculous clones of Bitcoin, but questions about them are completely on-topic in the Bitcoin Stack.
I would argue that there are only five cryptocurrencies with their own distinct codebase, and they should be allowed their own Stack communities:
Everything else either has a community that is too small, or is based on Bitcoin's code (or Ripple's or whatever) and isn't differentiated enough to warrant its own Stack.
The reason for this is that there are many questions that are asked generically (eg. stuff about scripts) that will have a completely different answer in each of those main categories.
That said, I do generally support a clamp-down on random scamcoins vying for relevance because they managed to click the "fork Bitcoin" button and add some idiotic, poorly thought-out "feature".