If as I understand, BA are losing nearly a Billion pounds a month it will not continue as a going concern. Nothing will change in the near term. If the vaccine is successful and distributed quickly and herd immunity is established then demand may start returning for next summer. That is the optimistic view. There are a lot of IF's e.g. anti vaxiners, lack of efficacy, demand itself etc.
My opinion is that the UK will need a national Airline going into Brexit. Therefore I think that BA will be re-nationalised.