IMO BlackCoin could be serious threat to DarkCoin. As a community we should take it seriously:
1. If BC implement DarkSend, DRK could be doomed
2. BC multipool is going to use X11 (this is already happening, it is just a matter of days)
3. I think that more "average Joe" kind of people will consider DarkCoin just a copy of BC because they will firstly hear about blackcoin, which is a big hype nowdays, and they have great marketing(Apple is big copy-cat, but people find it innovative ).
People pump BC because of speculation, not because any real value/use, and people keep buying just because they don't want to miss it, just in case.... until dump starts. Once a few big whales dump at once, people will panic, and the coin will recover from some of those panic dumps, until the hype is not enough to keep it up.
Coins without a real reason for existence end up dying, and BC doesn't have any real life feature, just speculation.