Two things.
I'd feel a lot more optimistic if Johnson had the backbone to resist the pressure from his rebellious backbenchers, not to mention the ever-growing clamour from the anti-vaxxer mobs led by the likes of Piers Corbyn - who, according to a news report, recently stormed a vaccination hub and attempted to assault the staff. I quite understand people's personal hesitancy about subjecting themselves to a novel vaccine and who are worried about possible side effects, but these gangs of thugs are something else.
IMO Johnson is trying to 'keep the peace' by appeasing them and at the same time placate the rest of us through appeals to 'personal responsibility', thus avoiding having to take any decisions which might affect his popularity and the popularity of the party. He has, I believe, taken the easy way out. And it's pointless speculating whether any other leader would have done better - or worse - because we simply don't know. The Tories are in charge and the buck stops with them.
... and if the media would stop its sensational 'shock-horror' headlines and report in a more sober and less dramatic manner I think people would feel more confident about the future. It does seem that although Omicron is more contagious, its effect is, generally speaking, less virulent.
We need the more thoughtful considerations of the scientists, published without drama... not some media hack's startling interpretations...
Personally, I am optimistic - mostly because it seems the majority are acting responsibly, and because of the dedication of those who work in the NHS. And because of the sober, measured language of the scientists who mostly seem to want to simply present the facts without the drama.