I'm no expert, but I do believe that the more interest is generated and the higher the demand grows, the more the sky's the limit :) I like to think of the market capitalization of more mature firms as a benchmark. It just shows how much potential there is in the young and still developing crypto market.

Back peddle a bit on 'the sky's the limit', one limit would be the number of people able to access cryptocurrencies..i.e. perhaps some of the lower societal levels living in technology-poor countries might sit out