I think there is room for us all. Ofc, a lot of altcoins will die off, mainly because their devs stop working on it, or because of unfixable bugs.
Here is something that seems nice enugh: http://maidsafe.net/ introduces their currency for the network. I might invest in that. DECENTRALIZE!
I hold
1) BTC - the mother and father of crypto.
2) DRK - because someone needs to up the anonymity
3) NXT - Lots of innovation here. The real downside here was how it all began and the marketing after. Lots of uphill climbing..
Darkwallet does not work in the same way as Darkcoin does? I think they have much more of a centralised approach.
But, if anonymity wins, we all in. So I really hope works out well.