Does bitcoin value will increase in the future if more people decide to use it?
Yes it will increase. As the demand of bitcoin increases, its value also increases. It is part of studying law of demand.
Even if the demand will increase, bitcoin will be doing what it likes to. Being unpredictable. Giving surprises at unexpected times. Making you crazy and feel like you are living in some sort of dream. But it does this time to time. It means, we are going to enjoy this experience many more times.
Just look at the way it soared in the last weeks of 2017. I mean, even experts fail to tell anything related to its future plans. I love this currency.