Too much volatility isn't good, makes people less likely to use Bitcoin as a currency.
volatility attracts traders. these kind of traders are only not interested in bitcoin as technology. they just want the profits. these kind of traders will leave the scene once the volatility starts to decrease heavily.
Volatility in Bitcoin will be present for a while in the future. It won't dissappear just like that. I would say that we need to grow quite a lot more market cap wise for us to become more stable. How much exactly? Well I would say that we need to grow at least 30 fold to see some major stability.