www.theguardian.com/education/2018/feb/18/cutting-tuition-fees-would-backfire-justine-greening-warns-theresa-may
Teresa May wants to make arts/humanities courses cheaper for undergraduates, and not every university course should cost £9250. Her rather interesting position is that the market has not done what she has expected (sorry, the free market has not emerged), so she is going to try and force it into a shape that's more pleasing, and perhaps more appealing to young people.
I don't work for a university, so I don't know how much your average humanities course costs to run. I do know that many (most?) STEM courses with regular labs, expensive equipment and heavy contact hours cost more than £9250 to run. Although these departments can bring in the big money grants, I do think there is a perception that (some?) universities overfill humanities courses in order to subsidise their science departments.
However, I'm worried about the proposals putting people from low income backgrounds or who are the first in their family to go to uni off STEM courses. I'm also wary that the proposals really amount to a real terms cut for universities in terms of funding.
Obviously the current loans system is unsustainable for the government when many graduates in all fields will never pay their loans back in full. Even high earning doctors might go to work abroad, or take career breaks, and so not repay their huge debts. However, I don't think this is the answer.