I think the timing of this is wrong, no need to pull it forward. Better get double doses into the children that want them.
However, I think the issue of the outside world suddenly becoming 'unsafe' is a strange one. Rates usually drop as we come out of winter (so could have been better to leave it another month or two).
Omicron is so spreadable, and asymptomatic, that going in public places naturally carries a risk. In fact, it is most spreadable prior to symptoms (if you even get any) and so the fact that it wasn't showing up til 3/4 days in on lateral flow and that PCRs take a day or two to organize means that if you go out in public, you are exposed to covid full stop.
Even my friends who were very careful through out the pandemic as CEV have just had covid in their entire family as they cannot isolate sufficiently enough- and luckily it has been not nice but not serious for them (so far).
The idea the world was safe before and now isn't is a false one, Omicron is far more spreadable than previous strains, which is why the stricter mitigations in Wales and Scotland haven't had much effect.
I've said before on here, the best thing you can do is wear a super mask such as an FTT2, that stops the vast majority of viruses getting in and is much more secure than requiring the outside environment to become 'safe'. It never was and it certainly isn't now with Omicron. That's the hard truth, and why I think countries are giving up. Not because it's a great idea but they simply can't control Omicron (see much stricter rules in Europe which haven't had much effect).
I'll still wear a mask in some settings, although as I teach with up to 100 students without masks every week, the onus is on me to wear one, they are not going to change their behaviour now after two years of restriction.