For you which could be the most important impact that bitcoin have made, will make or has been making to our society?
Simple as it can gives awesome and fast payment system with a small fee with it that's why many company accept bitcoin as payment method and through this you can also earn online also, can help people that has finance problem but bitcoin will not make you rich.
If you don't think that you will be rich with bitcoin then there's no reason for you to invest, if we dream we have to dream bigger and base on the past we have witness that there are people who became rich because they believe with bitcoin and trust it to be their investment.