DY i can identify the “other factors”
It is becasue we have a system where we expect a couple to develop a relatonship prior to mariage, yet make it exceedingly diffcult for the two to actually meet in an attempt to start a relationship.
The above was not the case 40 years ago, nor is it the case among chasidim. THAT is the real casue of the crises.
Anything that will get more people going out, get girls more dates, eliminate the amount of hoops people jump through to get a couple to just meet and essentially begin the process, will help resolve the process. (or conversely setting them up and just have them amrry and develop a relationship later)
Continuing the process we have now but with a closer age will do NOTHING to resolve the real issues.