When I went, back in the late 70s, a degree was free of charge to the individual and because only 10% of the population had the privilege of going, you really did not need to worry too much about the subject chosen. That said, I graduated in 1981, in the midst of a recession, and jobs of any description were hard to come by. Over time we did all get jobs, and I would say that my cohort have done very well over the subsequent years.
My elder daughter did A Levels in 2009 and was in a quandary about whether to go to university or not (no great desire or specific interest outside sport). Had there been jobs or apprenticeships on offer at the time, I would have guided her along that route. For want of anything better coming along, she went and did a degree in Sport and Exercise Science, which she enjoyed - but work in that field is poorly paid, unless you go on to do a MSc and specialise. Even then, the field of sports science is highly competitive. She enjoys coaching youngsters, so eventually went into primary teaching, for which any degree is acceptable, and she is doing well. At that point the annual fees were under £3000, so she is not crippled by debt. So the decision to go was valid in the end, on top of the social and personal benefits she gained from living away from home.
My younger one was always set on doing Physics at university, which she did, under the current £9,000 a year set-up. Being quite canny, she dropped down from her MSci course after the second year and graduated with a BSc, which then allowed her to transfer to an MSc run and funded by the university, for which she applied for a £10,000 bursary (she qualified on the criteria of being a female taking a stem subject, having been to a state school). So in her MSc year she was quids in to the tune of £16,500. She is currently training as a clinical scientist in medical physics.
So three examples from decisions to go to university in different eras and under different regimes.
I think my advice would be, under this current set up, to think long and hard about what and where to study; to fully investigate future employment opportunities; and to make the most of any opportunities for work experience / internships / paid employment along the way (in holidays, a year's placement as part of the course, etc.) - in order to maximise the likelihood of finding work on graduation.