why do you assume they wouldn't pay back the expenses under this proposal? obviously, when (if) they get a good wage, then they pay a higher tax rate to compensate.
and why the implication that individuals with uni degrees are the only people who benefit from their education?
why shouldn't corporations which couldn't even begin to function without degree-holders not also contribute to the expense of training their employees?
every time you enter a hospital, you're benefiting from higher education. why shouldn't you also contribute to sustaining the future of the system?
every time you use virtually any product or service designed or imported into the UK, you're benefiting from others' higher education.
and if you can accept those premises, then why not cover the costs of a degree up front, rather than saddling students (who for the most part are inspired to contribute to the community as well as just enriching themselves) with the burden of massive interest rates in a depressed economy?
adjusting for inflation thanks to Brexit, which students overwhelmingly opposed, the effective annual rate is expected to top 6%, twice even the American (!) rate, almost three times the personal bank rate, and five times the mortage rate. what's the benefit of making them tack on the expense of interest payments, even if they can afford it?
https://www.theguardian.com/money/2017/apr/11/student-loan-interest-rate-rise-uk-inflation-brexit
or should we also apply your logic by scrapping public institutions like the NHS, and just have everyone pay upfront or borrow to cover their own private medical costs?