Yes you should believe in the bitcoin because it has a great fiuture and it will grow a lot more so its just a matter of time before the bitcoin will become very popular!
This why many people are starting to use bitcoin for we believe that we are going to have a great future with bitcoin. And for those unemployed people instead of looking a real job. They are just working with bitcoins by different ways like trading, gambling and as well as selling their services to the people who needs it.
I think you need to prove something before you believes that bitcoin is not just a momentary phenomenon but bitcoin will continue to survive and have a bright future. perhaps like seeing growth of bitcoin and others? if it gives good results you can continue to trust and use bitcoin
For a long term investor like me, I would not believe in such statement as I want bitcoin to last while I am alive. The benefits of investing that I am getting is very extra ordinary, and in my life only when I started to invest in bitcoin I have been profitable and it gives me a decent income...
So you can expect I will fight for my goal.