What months? Months after omicron appearance? It has been here just about 2 months and boosters are still important because even though omicron is very fairly different from each previous variant we know, vaccine induced immunity still can recognize it after being boosted (it is related to antibody affinity if you want to know more).

Most importantly, vaccine induced immunity still protects against severe disease that requires hospitalization.

More importantly, if the herd immunity is the question - omicron and vaccination might provide very robust immune protection.

Another thing to keep in mind - because omicron was so successful, it may have blocked the appearance of a new variant that is a derivative of it and the next similar variant that might appear that is neither some pre-omicron derivative nor close to omicron.

Vaccination with the original variant is not a bad bet because it is most likely just in the middle of every possible derivation from it.