But no one will buy at $500 because who spends $500 on a coin really?
/s
One day people have to accept that buying a whole Bitcoin will be very hard and incredibly expensive.I mean who is able to buy a whole bullion of gold just that easy?!
People will have to buy mBTC and later even smaller units.
I think also that this day will come. As the price rises, we will have to learn how to operate in satoshis and honestly, people will not even notice a difference.
Maybe us, older users and early adopters will find this very nostalgic, the use of whole bitcoins but I am sure even we will get over this!