Is this a joke? It could even cost 50 bucks in ten years, but we are talking about what's reasonable now.
I really don't think the mainstream is waiting for 4k headsets to jump in. What they want is ease of use with quality experiences at a decently affordable price. If a 4k PCVR hmd came out tomorrow at $200-$300 and was still wired and needed a PC or console to run and cameras to set up around the room, they would be less interested in it than the Quest. I still think it's maybe $150-$200 from that sweetspot price point and it's still too early to tell how the software lineup will turn out, but otherwise this is the closest we've gotten to what they want.