That's not the point ( at least as far as investing goes).

There will likely be plenty of 'anonymous' coins over the next few years deploying various technologies. The 'best' technology isn't necessarily the most valued in market terms. You only need to look at the current market to see that.

Bitcoin, Litecoin, Peercoin and the like all have successors which improved on their technological approach. However none of their valuations were ever dented once they acquired the pole position in their 'class'. One of reasons for that is that although technological improvements are progress 'under the bonnet', the end user doesn't notice a blind bit of difference. There are also other reasons - basically investment priorities that rank higher that technical prowess as long as the technical integrity of the coin meets at least a minimum level.

For me, it's not important that the coin have 'ultra' opaque characteristics that defy even the NSA. I value this technology for commercial reasons. i.e. for making easy, anonymous transactions that are not transparent to commercial competitors for whom that information might be valuable.

Not saying that the coins you mention aren't interesting, but their emergence is just another horse in the race. It takes a long time and a lot of hard work and co-operative participation to get things right AND make progress in the market at the same time.

Darkcoin is now at a relatively advanced stage in that process. Those other coins are not. Thats why it's having its valuation revised. The underlying technology is just a factor - one that will have some but limited say in the ultimate outcome.