A colleague asked me this morning: "since I already had Covid in June I won't need the vaccine...right?" My reply: "ask an epidemiologist". I followed with: "I assume that they will recommend that you still get the vaccine."
I do wonder though, if someone had a great enough immune response, do you need to get the vaccine in the spring? I know they really can't know if immunity lasts for a year because they don't have that data yet. We will have a small sample test from a lady here at work. She was traveling for work (Asia locations) in March, returned home, and was really sick with Covid for about 20 days. She is now taking care of her husband who has a pretty severe case so we'll see if she has immunity. (Interesting note to this, he didn't get it from her in March/April).
They should have some preliminary data on if the vaccine lasts a year or not by April at least for Moderna as they started their very first human tests (safety tests) in March and I think Pfizer started those in May. As for someone who had it, it appears the only thing they are sure of is that antibodies disappear after a few months. Also remember you can get reinfected as Ganna has shown us.