Because they are a jealous bunch, most of them are butt hurt because they missed the boat and don't have enough money to buy lots of BTC. So they dream about $1 Bitcoin and how they'll buy thousands if that happens.
Yeah I agree there are just mad because they cannot afford the present Bitcoin price. So now they are waiting for the halving and hope that they then can buy some coins.
Nobody has missed the boat though. The coin itself today is as usable and buyable as it ever was. As its worth more you have to buy less to get the same purchasing power.
The only way that makes sense is to say all of bitcoins use or growth is in the past. There is billions of people on earth, only tiny amounts use bitcoin so all people have to decide is if bitcoin is useful or not.
If the whole world started using bitcoin then even now owning some bitcoin will be very advantageous as its still just a story not so much a reality, most of us arent using bitcoin to buy normal things. The boat has not left, just decide if it will float or sink in the wider world