Firstly there is no guarantee vaccinated people will not get really sick, they are far less likely to but not guaranteed. It appears likely the omicron is more likely to be occur in vaccinated people than other variants, especially those not boosted, but they don’t get as sick.
We will have a clogged health system full of unvaccinated patients, delayed elective surgery, ambulance ramping and wait times blowing out, people waiting too long for care, undiagnosed illnesses which will have an ongoing effect, staff tied up testing and pathology centres overwhelmed.
is that enough for you to worry about?
Not true, vaccinated people will still get the virus and do so but in smaller numbers and they will pass the virus on
The evidence ( so far not fully proven) is that Omicron effects the vaccinated far less than the unvaccinated but if they get it they can and will still spread it.