If you put the curve on exponential it appears fairly flat which I suppose is a good sign - indicating possible future exponential growth.
There are many many variables here (I suppose many people create multiple addresses) but it does appear to be picking up speed which is a good thing.
Is it the number of unique addresses with non-zero amount?
Or may be this is a number of registered emails on some online wallet like bc.i?
I have several wallets there (no more than 10, but more than one) but do not remember details (no funds on each account)
upd: oups. i see you are talking about bc.i
yeah point taken. Many people have more than one account. I had 3, all unused now as I switched to another provider though.
Still the uptick may be significant. Let's see what happens to 5M and beyond. I'm most interested in the possible exponential uptick. But like I said we need probably a few months of consistent exponential growth before we can get excited.
I would agree, SerenaL, I too have a number of wallets, I try to keep re-use of wallets to a realistic minimum. Perhaps more wallets might also mean that more people are taking Bitcoin security more seriously.
I also agree with ETFbitcoin, a better measure would be active users than wallets created. Perhaps even better would be actual net amounts of BTC in transactions, though an active user count would be a great indicator.