I think most humanities degrees receive no central funding now.
As far as reducing the fees - personally it's not my favourite way to lessen the burden on either individual students or families. The burden on families (as opposed to individual students) would be lessened by increasing the minimum loan amount. The burden on individual students would possibly be more fairly reduced by cutting the interest rate and/or shortening the repayment term. But in terms of reducing the burden and reducing the bad debt, reducing fees is the best solution. The bad debt is a massive sucking back hole which is increasing in size (as black holes do) and while nothing like as bad as the pension black hole it could still end up seriously trashing national financial planning. Taking measures now to address this makes sense.
As far as who it helps - the students who earn the highest in the future may well not come from wealthy backgrounds. I didn't, nor did plenty like me. And the people who don't pay it back aren't losing, even if they aren't winning. And their future taxes, to the extent they pay taxes, won't be expended writing off the unpaid fees of others.
I'm one of the people whose estates would be >£0.5 m should they pop their clogs right now, and whose tax reliefs will be impacted by being taken away although I don't make massive pension contributions so my hit will be smaller than most, and my estate wouldn't be that much more than £0.5m so my benefit wouldn't be that much either - I haven't done the maths but it's possible it would just about even out under the Tory proposal. I much much prefer the scenario where my lost tax relief is used to help all students. That will tangibly help kids right now, including, but not limited to, my own. The possible benefit of my kids having lower IHT at some point in the future (which would depend on neither myself nor DH needing to fund care - since we have just emerged from a care funding nightmare with MIL that is quite close to the forefront of my mind) is not something I would prefer to have instead. In this case Jam today (even weak runny jam and not much of it) is better than possible weak runny jam in 20, 30 or 40 years time. Especially when today's jam is for everyone to share and future!jam will just be for my kids. Who don't even like or want jam and hopefully won't need it.