proud tatty – no one is saying to stop Bochurim from learning in E”Y. All AZ is suggesting is to have the boys come back earlier. But, they can go earlier. There’s no reason why a Bochur can’t go to E”Y at 20 & stay for two years. So, I think you are missing the point.
You say that you have spoken with Roshei Yeshivos (ones with Emes Daas Torah). So, can I ask you – what was their solution to help the thousands of single girls?
Bottom line – send boys to E”Y younger & bring them back 6 earlier from E”Y & we will see more marriages and less singles.