DH,
Sorry, I forgot you were in Israel. I agree, in Israel post-secondary education may not be needed. [Although, if no one in Israel did post-secondary education, the country would have no doctors, lawyers, etc etc….but that’s a different argument).
In the US, it is basically mandatory in order to support your family. I’ve posted basic stats in the past.
And I agree that its more important to talk to your Rav today than look at the piskei halacha of past generations. Times have changes and its important to get a psak from your current Rav.
Rav Moshe’s psak (who incidentally was my father’s Rav and allowed him to go to college) was at a time where college was not nearly as important. Your current Rav would be better to discuss the applicability of the psak to your life.