You're overlooking the fact that training requires stuff, in the form of ammo. And right now, that's a problem that must be weighed by those of us already accustomed to our iron sights. I was all set to begin transitioning to the dot, but don't see it as a priority at this time. My risk assessment tells me it's safer to maintain current skills than to start something new, until ammo is more available. YMMV.
Mucho good point sir...
