I guess this is the result of the current bear market we are in. People that are only interested in BTC for the profit are losing interest because we haven't 10Xed in the past month, they came here for profit, lost their patience and are now leaving. In the background however things have never been more positive, there is great news coming from every place in cryptocurrency and adoption is increasing, but that isn't something people notice, which is why they lose interest. If/when we return to a bullish market it will look like people are interested again and the space is alive again, but in reality it has never been dead.
It is difficult to think that people easily get exhausted and distracted when Bitcoin unexpectedly turning down. I know people are expecting a more exponential price for Bitcoin but it was a big opposite coming around making them really disappointed and losing confidence. Thus, it only means that people are just considering crypto for profit gaining source and purely investment than rather than to consider as a currency in the future.