Most people do not accept new things straight away. It will take time for most people to move to bitcoin and use it for daily purchase. It may take decades for bitcoin to be widely accepted currency.
I don't think so. Only for 6 years of life bitcoins has only here on bitcointalk more than 500 000 users. To not tell for others who don't prefer to be part of this forum. Only China has millions between users and miners. the spread will be every day much more than the previous. The results and even the last bubble of bitcoin is a clear signs of this spread. It was an increase of demand from China which is behind the increase of price for about 100% and its drop at 50% (at least this is the most probably reason told by most of the analysts). The remaining 50% which is reflected in the actual price of bitcoin compared to the one before the bubble is a clear sign of the increase of the people which know and want bitcoin. And this demand are mostly new people which want to be owner of some bitcoins.