Sure it is loosing , Just look at the bitcoin price today , lossing , loosing and loosing.
I don't think bitcoin loses its popularity it's just because it's very popular now and continues growing.It's just normal for the cryptocurrency to fluctuate it's price.
In my opinion, Bitcoin dont loses its popularity, why? Simply because some investors are just starting to invest in bitcoin, they are just starting to make a lot of money with bitcoin. Actually my understanding in altcoins is not that deep because my family and friends are not using altcoin instead of bitcoin.
Bitcoin is now part of our family and were encouraging our relatives to invest here because it will be a big help for them to finance/support the educational expenses of their children.
Lastly, if other people will share their knowledge and encourage other people to enter the cyrptocurrency world it will become more popular even to those amall people in a community and willnever loses its popularity.