Dreams help us see opportunities that could be, if we'll stop looking at all the impossibility and see the possibility. Throughout human history people have said that's impossible! That is until a person did what others thought and told all who would listen could never be done. Placing labels on that person, as a dreamer out of touch with how the world works. In every way trying to stop a dreamer from dreaming, by telling them "who do you think you are your no one special! Your just not smart enough! Look at the risk your taking, your just going to fail so why waste your time trying and just except that this is as good as it gets!" The list goes on and on. That's the rub you see, how many times in your life have you been told something like that or worst yet told yourself that? Defeating yourself even before you start. Bringing a dream into reality takes time, and a lot of work and learning to deal with setbacks and a little luck. As for the risk, only you are capable of deciding if it's worth the risk or not.
For me if I risk nothing I'll gain nothing, so I say why not give it a shot, with each attempt that ends in failure teaches me something I didn't know before. That's how we all learn.
Having seen dreamers making such a huge difference in my life and the life of other's. I really do believe we need dreamers and the work they have done and are still doing will continue to change the world. Hope for the future is becoming a reality around the world as we all began to learn that each and everyone of us, are all members of the human race.