There are no easy answers to any of this, unfortunately. It sounds as though some of the students' situations described here are really unacceptable. All the academics here are able talk about is their own experience and, on the whole, it seems that we are providing a better experience, or trying to provide one, than what some students are having. All we can do is sympathise and advise these students to continue complaining. It is frustrating to hear these terrible stories because they don't give a true impression of universities as a whole, but they are the stories which will have the biggest and most lasting impact on prospective parents and students. But of course they do give a true impression on those individual students' experience, and that shouldn't be diminished.
Unfortunately what is true across most if not all universities is a level of disengagement from students, who often do not attend classes, and do not keep up with the work of a course, preferring to binge watch recorded lectures in the revision period and cram. I think that the redesign of courses going on now, to deliver courses in both online and on-campus formats will potentially be a partial solution to this, because the moves made to engage students who are forced to study online, problem based learning, flipped classrooms, will also bring the reluctant attenders into the "classroom" regularly and hopefully promote deeper learning. I have high hopes that, as a PP said, the standard of education will be raised by this experience in the long term. That is not to say that some of my colleagues are going to find a situation where they can't just pop in to a lecture theatre, drone for an hour on a lecture they've been giving for a decade to a handful of students and dish out a problem sheet quite challenging, which will be fun to watch. It is likely that not everything that we try in the coming year will work, but what I have been struck by in my discussions especially with my younger colleagues is a level of excitement and enthusiasm for teaching which I haven't seen in a long time.