Honestly, I expect the folks buying an Intel iMac are doing so because they either need Intel or they feel more comfortable with Intel now and want to see how Apple Silicon pans out.
I think you underestimate the disinformation of average people.
Just a few hours ago i watched a video about apple as a "super stock" and "how much pain" investors would have had to endured in the first decades of the company making it seem like it's some kind of "you could not have known when and if this would have been successful" while anyone informed clearly could have seen Jobs success outside of apple, his moves returning to apple, them getting back on track with the first iMac and eventually becoming a company that brought several paradigm shifts (iPod, iTunes, iPhone and AppStore) to the planets entire society.
Even these "investment experts" just look at the chart of numbers, and not at the stories that happened around them. I was like, of cause you could have seen these things, iPod was super hip at my school, we anticipated iTunes music store finally arriving in germany in the schoolyard. The reasons apple blew up were right in front of everyones eyes.
Still these people tell you, "we would have advised you to invest your money in a different place because Apple was to much of a gamble in the 80s". Theres way bigger amounts of money moved than just for a 2000$ iMac based on hilarious ly little and even miss information.
There is a famous quote from the world of sales. People love to buy something, people hate if something is sold to them.
Most people buying right now probably don't care or know about ARM. If they do they probably won't know what will be gone or possibly better on MacOS because of it. Like, look at these review videos we post here. Some of the "stars" on youtube maybe get half a million clicks. Most get far far less. Yet Apple sells five million of them a year, some even with fusion drive. Fusion drive still was sold to people less than a month ago, and people bought it. Life is different outside the tech bubble.