I disagree that bitcoin is fading out and losing popularity right now, every day there are big institutions buying up bitcoin and many more investors come to invest in bitcoin. Bitcoin is going strong day by day.
There can be various reasons why they think it is late for investing in bitcoin given the current price right now. Maybe they are afraid that events like the 2017 crash after the bull run might happen again. Investing in other crypto is not a bad decision either there are a lot of coins that have great potentials it really depends on their strategy. But for me, I think investing in bitcoin at this price is not a bad decision at all we just need to hit the right timing on buying.