its possible if it is used the same as fiat.. that's only a 12 trillion dollar market cap, which is still far away from ~60 trillion dollars of fiat in the world.
It's possible, but there are a few assumptions:
There had to be a complete redistribution of wealth to achieve that
Or are all talking about fiat inflation and in 2020 you can buy 1 bread with 1 bitcoin worth 10 million usd?
You can't meassure btc alone with fiat.
The import part is, what can you get for 1 btc.
If you can get a house (worth today 500k USD) with 1 coin, then there has to be some major redistribution. That means, we need a lot more fiat in this system, we even need all of it currently available. How likely is that? 1: 10^12 or even less.
It's like a pyramide. To increase the price, we need massive amounts of fiat.
I just ride the bitcoin train as long as it's driving, but I'm not as dellusional to believe we could even reach 1 million per bitcoin in current fiat value. That would be generation wealth out of thin air.