Maybe the lost in interest is true but it doesn't always become a permanent loss of interest, it is the loss of interest for now
Strictly speaking, we don't know that for certain
As what we saw in 2017 may well have been a one-time event, i.e. a lifetime opportunity to earn via cryptocurrencies (and get done with them). Indeed, the market may recover eventually but it is not very likely that the hype that you mention is going to come back, at least not in the near future (and then it will be a new hype)
Apart from that, it is not completely impossible that won't go lower as the bear trend doesn't look over at all. With that said, I agree that some could return after we get to 10k and beyond but we should first get there which seems like a daunting task on its own