Here is what I mean,
Imagine if 1 satoshi = $1 ..... WHat would happen to the fee, I mean 1 satoshi is smallest fraction of a bitcoin. It would be stupid to buy a $10 meal and the fee being $1-$2
In today's economy , there are around 5 trillion dollars , if you consider all economies.
Let's say 15 million BTC are mined , that will mean that even if the entire economy is only Bitcoin , each Bitcoin will be worth 5,000,000,000,000/15,000,000 = 333,333$ in today's money.
Bitcoin will never be worth a million $ of today's money. Sure , it may happen one day when USD has inflated so much that it is worth a cent of today's money. But in comparison to the money of now , Bitcoin can not cross a million.