Yeah, I think I have seen that chart before.... or something like it.  I will also say that what has been true in the past, may not be true in the future.  Your chart shows unemployment.  It does not show underemployment - people working well below what they are qualified for.  It also does not show the debt load that many of today's college graduates are carrying.  If I remember correctly,  some are predicting that this could be the "next bubble to burst".

I would never advocate not completing High School.  And I think there is a lot of value in a trade school.  I just don't agree that a 4-year college is for everyone.  I believe too many are attending 4-year colleges, not knowing WHY they are there ...... except that "it's the thing to do".