We created a country where education started to be widely available and financially supported for a large fraction of the people. What do you expect would happen as more people get educated then? Companies wouldn't use a commonly available criterion to weed out who they want? Or develop technology that takes advantage of large numbers of educated workers?
In the evolution of our demography and economic history too, this is no surprise. We're no longer in a post-war growth phase where any warm body was suitable for filling the basic jobs necessary to fuel our growing economy. Other countries are in that phase, we are not. We have low growth, and for someone to stand out and get hired is now a higher bar. Our labor is expensive, so complicated equipment and automation gets used. And there's an educated workforce to operate it.
What company wouldn't use some available criterion to choose people of with more productive/reliable attributes? College degree is available, it's a not unreasonable proxy.
It's inevitable.