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?
Nah, but i dont think we should be too concerned about lost coins, because in the unlikely case that the circulating supply gets too low(because of lost coins) to still be functional, we could add more decimal places to it and so never run out of it(with the positive side effect of not screwing anyone up, because their amount of coins remains the same).