If you arent teaching them to shoot under more realistic conditions, it doesnt matter what the sights are. Iron sights arent going to do any better if you arent accustomed to shooting with (or without) them under those various conditions.
This is another one of those things too, where you are in the learning progression of things, whether or not youre fighting it, or just accepting it, and your brain only knows what it knows and isn't in a position to think to fight it.
From most of what Ive seen posted here and elsewhere when there is resistance to the dots, it comes from those who learned on iron sights, don't have any experience with the dots, and from the sounds of it, dont want to have any, or make the effort to learn. Those who start with just the dot don't know any better, dont have to fight things ingrained with something else, and don't tend to fight things. This same sort of thing usually goes on with any kind of changes or advancements, stances, grips, etc..
Im a firm believer though, that if you're one who has been around awhile and come up through the different "improvements" over time, have experience with them, and are open-minded and willing to continually move forward and learn as much as you can about the "new stuff" as it shows up, you will be WAY ahead of those who are only just learning the "new stuff" and know nothing of the old, "outdated" ways.
And if you know who Bruce Lee was, and his thoughts on things, and are willing to embrace that line of thinking, you'll be even farther ahead.