If parity is important, then indeed, how are Unis going to treat students the same across different years?
You don't think we've already planned for that, and that processes are not already in place? And indeed, have been in place for years (sudden death of a lecturer for example, or the closure of a department and "teaching out" a degree course).
We actually do know what we're doing. I have 35 years of experience in three different national education systems on 3 continents.
Academics have to be extraordinarily good at what they do to even get a postdoc and then a continuing academic post. We work at a very high level, and we've been planning, risk-assessing, and adjusting ti changing circumstances since March 2020. We are still planning, using our expertise and judgement.
But hey, come here & tell me how to do my job, because you have children at university or once studied there.