Bitcoin doesn't need to lose its decentralized aspect to go mainstream. Mainly because of the fact that Bitcoin will always remain an alternative -- which of course I am very happy with. Bitcoin will surely grow in the future, but more as an investment/store of wealth solution. We just have to accept that in our daily lives fiat functions better as currency tool. It's no surprise that banks have upped their game to push all kinds of apps and advertisements into the public. I am fairly sure that's due to Bitcoin.