Oomis, I think this point bears repeating:
The age issue is a major factor. But if we’re going to create a pie chart, let’s say that it’s 30% of the problem, and the other important factors you mention are the other 70% (say, 5 – 10% each). Now these numbers may seem silly, they’re not based on ANYTHING other than to illustrate that while age may be a major issue, it is not necessarily the MAJORITY issue, and yes, if the other issues aren’t addressed concurrently we will still have problems.
Now, how to address the problems? I wish I knew. Look at the plethora of good, really good books written on building a bayis neeman, all the workshops, the CCHF shiurim about bein adom lachavero, et al. Good people have made good efforts! We’re still in galus. We’re still imperfect people influenced by mishagasin. All I can say is, keep on trucking. Keep talking about and keep raising healthy children, resourceful, with good middos, who know what it takes to build a Torah true home.