The transmission rate will fall although that's not been quantified yet. If we can vaccinate at 2m per week I don't really care. Serious illness is what makes Covid-19 frightening and these vaccines end serious illness.Get the point but what's overlooked is that people who've recieved a vaccination could still able to pass it on to those who have not. Science is still very much unclear on that.
So unfortunately although a massive slice of the most vulnerable will have some protection - thank god - the spread rate by ticket sales in March is still very much up in the air.