The growth in the usage of bitcoin has been exponential from the start... As the rate of adoption inceases, the pace of growth accelerates even more
yet we are stuck since more than a year already, the impact if the last ATH from the big dumping that happened afterward, has frozen the good opinion that many had about bitcoin
now, because of that they are reluctant to trust bitcoin again, and this will not change until further improvements on any aspect of bitcoin
Well in the last year we were rebalancing after MtGox's fake pushing up of the price. If you compare to 2 years, we're at 270$~ vs 110$~ which seem pretty good imo. Now that we're mostly stabilized after the aforementioned bubble, we can start getting real growth data from what will happen from now on.
Unless another bubble hit soon...