Don't really know what would happen with bitcoin in the future but for now I believe it's at highest peak and is not gonna drop down to like 5-6 years. That will be insane if it really happens but I don't see any reasons for that to happen.
I also believe that in the next 5 years, bitcoin will last in the first place as it has the potential for growth and development. And I can not predict too far, because every day there can be new crypto-currencies that have a chance to destroy it.