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.