Honestly, i don't think if that things (title) can be happen. Because yes a lot of people can use social media although just get new phone, but for trading i don't think about it. Even me don't have that 2 app that OP mention, maybe if big exchange trading app or maybe blockchain wallet or any wallet that already realy famous maybe can reach but maybe not same yet with social media app.
Social media could be surpassed, as in one single version, not all. For example, we could have more people trading per day than there are people tweeting, that might happen, I know it sounds unreasonable because one is free while the other one is requiring your money (you can earn more but you can lose more).
However not all social media places are like facebook, instagram, twitter, reddit or the likes, some places are smaller, for example this forum could be considered a social media, it is a forum but that is a way of being a social media as well, and trader numbers are higher than here for sure. So, that means there are some social media places that have higher active user count than daily trader number, and there are some that has lower active user number than what we have in daily trader number. This is why I think it is quite possible, just not as a whole.