Bitcoin is started in 2009 and its price is in basically none from 2009 to March 2010 . In July 2010 its price is $0.08 and now its price is 8067 USD. if it is popular, then its price is increased. In the future, it will also be increased. so Bitcoin is not losing popularity yet.
Actually Bitcoin is gaining more popularity and we are in the process wherein every countries are in deliberation whether they will accept crypto as their additional currency or not, or if they will legalize it or not, Bitcoin is 10 years now, we have long way to go and people are now becoming more aware and joining every opportunity in crypto world, so I don't think that it is losing popularity.