Ah, so now we have it. It is resentment against younger, better-qualified people that is behind these posts - I thought so.
What you say is right, inasmuch as it is much more common for people to have degrees now as in the past. On one hand, this means that those without them might find career progression more difficult, which will be frustrating. On the other hand, though, in the days when fewer people had degrees, those who did, talented or not, were pretty much guaranteed a managerial or professional role if they wanted one. Nowadays things are far more competitive, so it's not as though young people just walk into guaranteed career progression.
Also, there has been expansion in the number of people going into HE for decades now. When this was less of a norm, and as has been said several times on this thread, there were other opportunities for those without qualifications to gain them. Graduates didn't replace 'on the job' learning overnight. Those who went into jobs with neither a degree nor the opportunity to gain work-based qualifications will be thin on the ground now, or very much at the older end of the scale. It doesn't make sense to compare career starters with older employees, as it has always been the case that 'newbies' are inexperienced and need time to bed in.