I disagree, because I don't think most people actually use bitcoin to buy things, i.e., treat it like money--and yet here we are 15 years after its creation and it's value has skyrocketed and it's become about as mainstream as it's going to get.  So even if nobody spends it, it can still function as an asset like gold, a stock, or whatever.  And if I was back in 2010 looking at bitcoin's price today, I'd say it's already arrived at the moon.