Actually there are 4722 valid identities.
As for the "crazy growth" of the network, I doubt it, since the reward is getting smaller and smaller with the network growth, so many will leave. Maybe this will change in the future since we are on a semi-mainnet (semi-testnet) phase.
^Is that so? I think the more people who join the network, the more rewards the user can get. It seems that I was wrong.
^I have downloaded Idena, but until now I haven't received the code
