The upbeat attitude of bitcoin holders now is better and more mature than was few years ago. So, bitcoin becomes hard to lose value or atleast crashes as once did (hopefully).
The price of bitcoin is purely speculative during the initial stages and there were not much users to hold the price from crashing and that is not the case now,we have big time investors trying to make profit and whenever there is a small correction these whales starts purchasing those and kept the bull run going for a longer period of time,the only possible way to lose its value is the scalability issue and if nothing is done in the long run.
There are some problems with the speed of transactions and block size, yet these problems can be solved within the core code. They can implement new upgrades for bitcoin to get rid of all the problems.
Not that hard I believe. Moreover, price corrections are normal, bitcoin cannot go up continuously.