1% of world population = 70 millions of people.
There will be 21 millions bitcoin , so more than 1 btc per person for 1% of population is not possible due to something called maths

exactly, that's why 1 bitcoin will be EXTREMELY valuable if enough people in the world start to decide bitcoin is more useful than dollars/euros or credit cards.
and i'm not even talking about other things, as bitcoin can replace much more than just money.
buying 1 car or 1 house for 1 bitcoin is just the beginning
Just the beginning.