Bitcoin is an online currency. Even if started with a lower price. Now its value is beyond the reach of ordinary people. But, nowadays, it seems that Bitcoin is losing its popularity.Because, not receiving validity in low income countries. It may be the main reason.
In my opinion, Bitcoin is not losing its popularity now. On the contrary, I think that Bitcoin adoption is getting to a better level in progress of time. We can't say it is losing popularity just because the search numbers of Bitcoin on Google is changing.