Bancor team is continuously keep adding new tokens which is increasing total number of token without any stop. Just imagine limited supply of these BNT and which it will be started to use widely at large scale where it will be at value. At least $100 easily in few months so still very cheap now.
It's impossible to predict how much the future price will rise, but what is certain is that the application of Bancor continues to expand and become popular, which is the key.