I want everything to be f2f as much as possible too, but think I'm being realistic about the situation and challenges to this.
Last September - no COVID variants were circulating, so allowing students to return to the country was less risky as they had the same COVID we had. There was also still the provision that if they couldn't return, everything would be available online. We're talking about taking away that safety net for next year and as it is highly likely we will end up with a surge in cases at some point and the disruption caused by having to stop everything mid-semester because the government decides to is possibly worse than allowing students to return but have blended teaching and less f2f than in normal circumstances.
There are consequences to deferring a year of study e.g. some professional courses have time limitations to complete studies, visa requirements for international students, financial implications of not getting a student loan for a year. Many unis will not exclude their international students like this, and risk reputational damage worldwide, as they rely on them to subsidise the cost of home students.
I would absolutely welcome a legal challenge if either the government doesn't change its stance or individual unis are not doing all they can. However universities are massive complex operations, of which undergraduate teaching to home students is just one part. I can completely see how students view their lack of f2f teaching and the hit it's had on them and their mental health. There are just so many more factors to consider, that demanding full f2f next semester is not feasible. I will add, again, I want to see as much f2f as possible, but university next year is not going to be back to normal and students should be prepared for that.