I know this might be super late, but its seriously concerning that people are happy to increase more deaths than herd immunity, and are actually prioritising their education over innocent peoples lives seriously baffles me? Would you be happy if your family members died as a result for herd immunity.... probably not. The government's initial plan was for herd immunity and look at what that caused. For someone who mentioned about the car crash, that's an incorrect comparison, since if you have the virus you have a chance of passing it on which you can't do for a car crash.
Anyway to answer the original question, I think universities may be back to normal by November under certain circumstances. If at at the current rate the number of deaths and cases continues to decrease even with an softer lockdown then we are very close to beating the 1st wave by mid-Summer. If that's the case I can see universities opening by November or even September. Now the problem is the 2nd wave, which will come as a result of opening borders; If the borders remain strict so no international movement (apart from nationals) then the unis may still be able to operate as normal on Sept. I do hope universities open by Sept, even if it means that international students have to do their learning online (A reimbursement should be given to their studies), sure they're not getting the same experience but if they come then they will contribute to the 2nd wave and cause everyone to learn online which I think is unfair.
Either way, it should be the lecturers choice as to whether they want to conduct a lecture/tutorial/lab or not in terms of their safety, but social distancing measures can be used and people can wear masks at the end of the day.