Actually, bitcoin was created to be scarce with time.Bitcoin is a deflationary cryptocurrency created with a limited supply of 21 million token, and the deflationary nature of bitcoin is one of the qualities that enables it's growth and potentiality. The number of bitcoin today is not the same as when bitcoin was created. Bitcoin mining is one of the ways bitcoin is reducing in circulation and another way the number of bitcoin is reducing is through bitcoin halving enabling miners reward to be shared into two halves. So that is the characteristics of bitcoin, so I believe since the number of bitcoin in circulation is reducing is possible that the whole bitcoin can be mined.But even if the whole bitcoin is mined it won't stop the growth of bitcoin instead it will still add more value and growth to bitcoin.