Though I might be wrong on this but I think the main or the core reason of creating bitcoin was to use it to trade p2p which is to buy goods and services online but that part or function of bitcoin creation is not working perfectly yet and I don't know if it will work in the nearest future.
You are talking about mass adoption, I'm not sure if Satoshi (or someone else) ever made like a diagram of all bitcoin's theoretical step but I'm pretty sure that mass adoption would be the last step, or one of the very last. Let's not forget that it's been created only 15 years ago and the achievements that it reached are pretty insane. I'm pretty happy with all the goals we've already reached, let's see what happens in the next 5 years now.