Last I heard, they were getting (or had gotten) rid of Vo-tech (in Georgia anyway) because they didn't want to 'differentiate' too much between students.
For example, they didn't want one student to be deemed less capable or educateable than the next. The 'stigma' that comes with vocational education was deemed problematic so they scrapped the system and brought those students back into the 'fold'.
I think it also has to do with SAT scores and their connection with government funding or whatever creditation. Fewer students taking the SAT, lower scores were going to mean that a school system gets dinged by the government. The school I worked for was doing back flips to try to up the SAT scores - offering Latin, teaching SAT preparation, bringing the SAT prep curriculum into each and every classroom and subject. I was the Ag teacher, on the vocational/tech prep track, but had to do 10 SAT vocabulary words each week.
Sorry I'm vague on the technical terms - this is information that I have been actively wiping from my memory banks since I left the Georgia school system almost two years ago.
Instead of having a separate vocational system, they offered students pathways (agriculture, automotive etc) that prepared them for jobs after high school . There was college-prep and tech-prep, but the tech-prep students would blow off the SAT and lower the overall scores. So they got rid of tech-prep and everyone had to go down the same track.
I have no idea what the current 'trend' in high school education is, I'm just really glad it is no longer my concern.