My eldest didnt go to uni and neither did any of his friends. My eldest was never academic and struggled in school/college and it was never something he even considered.
My second son starts uni in sept and all his friends are also going, i know because i spent a week helping them all write personal statements as i interviewed for a uni they were all applying to as they all want to go into the same industry that requires degree level studying (all areas of computer science). This has always been a part of his plan since starting secondry school.
My youngest is about to start GCSE's and uni is in her plans, again though because her career goals requires degree level study (nursing or paramedic). A lot of her friends are looking at uni, though their aspirations are more varied than my son's friendship circle.
I guess it depends on career goals, and the child. 2 of mine have very clear aspirations that require uni, one didnt. If they dont i guess it depends on interests, my eldest is very outdoorsy, but also very much into how things work and go together, mechanic, eletrician, building work etc type roles were what he was looking at so uni was never condisdered, but if his interests were academic, even without a career goal, then may be uni would have been looked at more whilst deciding his future goals.
Mumsnet however, isnt the best cross section of society to gather accurate statistics that represent things like this.