There seems to be a trend not yet recognized by many experts and that is the withering interest of the people on Bitcoin, especially if we compare today with the days of 2017 and early months of 2018. Of course, we could not expect that people will always like, search and talk about Bitcoin for years. There will always be a plateau and a possible downtrend, sometime somehow.
No, people still interested to bitcoin and still growing as time goes on, it doesn't measured based on the days in 2017 to early of 2018.
You can check how many new exchanges are opened every year, how many people sign up to major exchnages such as Binance and Coinbase every month, and check the daily trading volume, the trend is increases.
Cross checking all these tells how Bitcoin adoption is increasing gradually. People are rather gaining more interest in Bitcoin and that is why Bitcoinstill occupies the largest market cap and its dominance is about 60%. Bitcoin Halving which is set to happen in 2020 will bring more attention to Bitcoin on a world wide scale.