I'm sure that bitcoin can last at least 20 years from now, which makes me sure because the number of users continues to increase and of course more and more countries already support bitcoin for transactions.
It could be possible more than that if the government will fully supporting blockchain technology. We aren't fully developed and everyone still on the adjustment that causes some delays.
Assurance to the market will looking for,and if that shown to the community, it surely gains more mecharnts and institutional investors will come.