As far as I know bitcoin have limited supply, and according to the articles that I have read it is about 21 million. I hope that this supply will never end, and I hope also that shortage will not occur. 
so far, the existence of bitcoin is limited, and only amounts to 21 million. then not everyone can have it. Moreover, actually getting bitcoin is quite difficult, because the amount is limited. but even though the amount of bitcoin is only 21, it does not rule out the possibility that we cannot have the opportunity to have bitcoin. if we have a business, of course we can get bitcoin