Even if bitcoin becomes a global currency this value is impossible to achieve, bitcoin can never be a $2m coin at any point of time.
Ok then please explain why it can not achieve that value!
And why the hell you see Bitcoin only as a currency? It's why more than that!!! And when you understand that and see all the other things what Bitcoin can be used and be good for, then you realize what markets these are Bitcoin could take a piece off.
Hell there will be use cases and businesses we have no clue about right now because it's too early.
Or have you thought in 1995 about youtube, Netflix, wikipedia, twitch, facebook, twitter, google? No of course not!
But there are people, developers out there who think outside the box and have lots of imagination and creativity.They are just waiting for one or the other new implementation to the protocol to make their ideas become reality.And one of those startups might be the trigger for a Bitcoin major breakthrough, just like the world wide web or email was for the internet in the 90s!