Bitcoin has not reach it goal because many obstacleshas been hunting bitcoin on the way to success and this made it to rise and fall often than none. If it can stand the test of those day it will definitely stand the test of time
I think the purpose of bitcoin is to be a world currency reference for the future, bitcoin hasn't even been able to convince the government about binding regulations, but for widespread decentralization, I think bitcoin has succeeded and opened the minds of many people to be actively involved, I assume still 20% of all progress.