My questions is that ' is there any possibility that some point in time in future BTC community might decide something which can retrieve this lost BTCs?
At the current configuration of the Bitcoin protocols, it is a NO, but who knows, maybe one day a consensus can be agreed upon where idle Bitcoin for x amount of time can be retrieved but of course, it needs a fork for that. I am not into forking Bitcoins just for the sake of retrieving "lost Bitcoins" because this may cause a huge problem when one day the owner of those "lost Bitcoin" decided to move or use it.