Im pretty sure Second Life Lindens and Cryptopias PED's are still in full function.
Not for much longer. Voxelus won't be the only VR app. Fungibility is important. And there is an economy-of-scale with one ecosystem in terms of building all the performance, scaling, anonymity and other features needed in a real-time, virtual currency.
Lindens aren't going anywhere anytime soon. The only people left playing Second Life are those that treat the game as their actual life.
I mean as a shrinking (relatively speaking) market towards irrelevance. Expansion of virtual currency markets will radically accelerate with network effects due to an eco-system and more degrees-of-freedom with fungibility. In other words, Lindens are beyond their half-life peak. Voxels will probably have a half-life of about 6 to 18 months.
Voxelus should be trying to make their technologies into APIs and create an ecosystem. And stay away from making a virtual currency since that isn't their area of focused expertise. Some of us have been working on crypto-currency for 3 years. They could partner with a virtual currency or better yet interopt with all virtual currencies and build an exchange into an APIs for developers.