Why so pessimistic? There's possibility Bitcoin price going to the moon either because mass adaption or legalization on big country.
By then, people would feel Bitcoin transaction fee is expensive, even though it fees on Bitcoin is unchanged.
I don't think saying that Bitcoin price will not reach 1 billion is pessimistic lol
21 quadrillion dollars market cap is a lot.
According to this, CIA says there is only 80 trillion dollars in the world.
So there isn't enough USD for bitcoin to reach this value. Usd would need to devaluate through inflation for that to happen (I guess)