I believe that reaching 1 million will be important and symbolic enough. I don't think by then the news will be that, that 1 sat=$0.01, but that 1BTC=$1M.
This is what will be everywhere but some people think that it is very possible that people will not be using bitcoin for the price and use sat instead as bitcoin price is increasing but which I do not find to be true. You can see what they are proposing with the BIP177 recently which they want to make sat to become bitcoin instead but which is totally nonsense.
Bitcoin will still be useful and reigning as the most reliance and potential hedge to store values at any cost of it price.
$1,000,000 per bitcoin is of course an anticipation in the future and that high increase is what proves it the hedge against inflation because of it sustainability of valuable increases while the stock remains fragile.
And that point of it getting to such huge amount of $1,000,000 doesn't mean the average ones can't buy it rather the greeds will feel low esteem with their little fractions.
But for Satoshi to be reformed in replacement of bitcoin is what could riddle bitcoin but I doubt if such news will come to reality.