If omicron is as infectious as immunologists are saying then:
All the talk of ventilation and protections... their effectiveness against omicron becomes highly questionable
Its likely that you will get one case in a class and two days later the whole class is down with it and the whole school dominoes more or less within a week or so through siblings.
That also means any closures will be swift and then over rather than a bit here and a bit there and the general uncertainty.
And its likely to be a universal thing rather than some schools more badly effected than others.
Bubbles become pretty pointless at this juncture imho. They have not really worked for Delta anyway.
It changes things. Closures are almost inevitable. Some schools will limp through, but if there are legal requirements to isolate thats pretty much going to prevent that anyway.
The reality is even key worker and vulnerable child provision is going to be difficult in this scenario.
That has knock on effects.