Children of 17 do not suddenly become fully functioning and independent adults at 18
Thing is, if you think your DC is not going to cope at university, perhaps do the parenting bit, and work with them to see why that might be, whether a gap year would help, what other kinds of strategies you as a parent could undertake to prepare your DC.
It is not the job of academic staff, nor of professional services staff (are are all-round wonderful at my place) to do your parenting for you.
I've had students try to commit suicide during the time I was teaching them (fortunately it's only happened about 3 times in my career, but multiply that by all academic staff across the country). All of the students had entered university with quite severe MH issues, and a couple fought to stay at university against all advice from academic staff for their academic progress, and professional health advice.
Parents need to parent. Our job is to educate.