They all already know, probably long before I do, and definitely before you do (if ever)
Bluetooth headphones saw double-digit growth with a 42 percent year-over-year increase
With more and more manufacturers removing the headphone jack, dont expect this trendline to change anytime soon.
So I googled, and the results opposes your claim. The iPhone 7 did set a record sales, all without a headphone jack. Of course there are people, like those you mentioned, who ditched the iPhone/HTC/Moto just because they no longer have headphone jacks, but those are just a niche I was talking about. It is obviously a niche as those group, worldwide, dont make even a tiny dent in the sales figures.
Except I, and many of us, actually have. Either we dont hear the difference, or we do, but its just not worth it dealing with the cables. In most cases its the former. As I mentioned earlier, I have tried both BT and wired mode on various sound systems. I dont know if those are something youd call “crap”, but I cant afford anything better than that anyway. To put things into perspective, the vast majority of people dont mind the sound quality of the headset that comes with the device. I think that speaks a lot about how small the niche is.
As @Alexandr_Smirnov mentioned
Ultimately the convenience will take over, as it happens again and again in every aspect of life.
For most people: Who cares if wired sounds 10% better, if I could get 90% of the quality without the cables. That was the same logic behind WiFi, wireless charging, wireless keyboard/mice, and even automatic transmission in cars.
Of course, thats not to say those will completely disappear. As evident today, you can still go out and buy a laptop with Gigabit LAN, a wired keyboard/mice, or a car with manual transmission, but it is obvious that their popularity is on a downward slope. Especially compared to their more convenient counterparts.
This is actually a good point. MacBooks are designed for professional and people who use it for working in professional environment, hence they keep the 3.5mm headphone jack for those applications. Thats simply not the case with the iPhone.