We may need to have boosters, like vulnerable people do to protect against the flu virus.
As for the virus itself, it is likely to evolve variants that are more infectious but less dangerous to the host. This is a trade-off that most types of virus make. Any health official telling you new variants might be more dangerous are usually just scaremongering.
We'll learn to live with the virus. I think there could be local lockdowns if hospitalisations rise during winter but I don't think there will be another total lockdown.