A vaccine being distributed does not mean COVID ceasing to exist. It does mean abandoning the vast majority of precautions people are being asked to keep, and probably will stop the need to implement extreme temporary measures every so often altogether.
I think a vaccine is coming a lot faster than the end of 2021.. End of this year is almost certainly going to happen. You do realize there are currently 2 vaccines in use by major world powers already as we speak?
This does not mean COVID will be completely over. But it will completely change the way we approach it.