Bitcoin is mainly adopted for its volatility and not for liquidity.When bitcoin price starts remaining stable means, that bitcoin is adopted by people in a wide range, so that no one can affect its price by pumping and dumping.Traders can gain profits only if bitcoin price is not stable and is volatile.They benefit by trading it against US dollars.I think, if bitcoin price remains stable, it would be dumped for price to fall..If bitcoin had a stable price, then its adoption would fall.
Do you think investor are the majority of people in the world? They are just a certain percentage. Merchant are also called investors but they thrive on the stability of the currency. Adoption of people who are getting profit in volatility will certainly fall but bitcoin life does not depend on them alone. As those investors who take profit in fluctuation retreat their adoption, investors who likes stability will take the scene and adoption will flourish because Bitcoin will be presented in masses in form of payment in stores. Developer will certainly will fix the confirmation delay and it will never be an issue for bitcoin in the future.