How many of us really believe that bitcoin will disappear somewhere in a few years? There is more expectation that the opportunity to get your share of bitcoin will become less accessible to many. If anyone reads enough discussions here on the forum, they will see that many countries and large companies are building the infrastructure to support mining for a very long time, and it is unlikely that they are doing this in order to lose everything in a few years. Thus, even if you do not study bitcoin deeply enough, you can draw your own conclusions based on how many very large and significant players in the world feel about bitcoin.

I definitely don't expect bitcoin to go anywhere in a few years. I'm sure it'll be with us for a very long time. Not forever just because nothing is forever.