If 50K daily active users can create 1.5M transactions a day, can you imagine the volume of activity when there are even 5 or 10 million on here?

Mind-boggling and best left to the imagination. With steem ,people do not really need a lot of convincing to be a part of this epoch-making platform because of its decentralized nature . Yes ultimately transactions on this blockchain is going to plummet to astronomical propensity, and it's all happening in no distant time.