I don't think speculation and volatility are a problem at all to bitcoin. Both aforementioned factors are what makes bitcoin what and where it is today. In my opinion, speculation and volatility are actually beneficial to bitcoin's price value making it profitable to the users who are investing, trading, and holding it.
Speculation is what triggers the volatility and volatility is the one that is in charge of the trend of bitcoin on the market. I think both play a great role in maintaining bitcoin's value and popularity to the masses. With speculation, people will start to wonder if it's a worthy investment and with volatility, they will be encouraged and enticed to risk into it based on what they have researched.