The teachers who are at highest risk, i.e. the older ones and the ones with health conditions rendering them vulnerable WILL be vaccinated pretty soon as part of the national roll out program.
Not sure why young and otherwise healthy ones should be put higher up the queue to take the place of older/unhealthier people generally, as they're at least risk of serious consequences or death from covid. Yes, there will be exceptions, and yes, a few young/healthy teachers may well be very badly affected and some may even die, but that is still the risk for those vaccinated as nothing is 100% guaranteed, and is the same in all jobs and among all aged/health groups.
The plan is to target the highest risk groups first. Teachers who aren't older/vulnerable, will be further down the list, but highly likely they'll still be prioritised in some way once the most vulnerable groups have been vaccinated.