yeah we cannot say that bitcoin is already mainstream because there such people who know what is bitcoin really are, and most of people are didn't yet know the bitcoin and also more people more likely to used their own currency than bitcoin, because they though that bitcoin is NETWORKING :3
The only way bitcoin could be assumed mainstream when there is a significant amount of people enough to stop transacting in any other currency except bitcoin. The amount of people who would desire this evolution would be enough to cause a change/effect loss in the market if they did not buy anything despite being potential customers of this organization/business/etc. As of now, bitcoin stands
not mainstream.Yes we could say that if most of people used bitcoin not totally all, but its a long time to happened that situation, we can only do is still support and used bitcoin or buy bitcoin to maintain its price so that users will not go and leave the bitcoin community.
I think there are more ways to support bitcoin than just using bitcoin, we can really help bitcoin if we actually make it a part of our life. We should talk about it to other people or else get more involved with other people in the community and make apps and websites which drive more potential users to the bitcoin world which educates and also benefits them