Personal opinion: Maybe, but it would have been too late. The current vaccine is not perfect, but it did one thing very well: it seriously limited the damage

Personal opinion: Maybe, but it would have been too late. The current vaccine is not perfect, but it did one thing very well: it seriously limited the damage done by the deadly Delta variant. Omicron and other immunity-evading variants would have come eventually, but thanks to the vaccine, it did so with less dead people along the way. Had it come a year later, it would have been useless in that role. And now that we are apparently done with the pandemic phase, we have a bit more time for more thorough research and better long-term testing.