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?
To begin with the fact there are coins which have not moved for a long time does not mean those coins are lost, we have seen many cases of coins that were thought to be lost eventually moving, so unless someone which was the confirmed owner of the private key of a particular address later stated they had lost their private key we cannot know for sure if the coins are lost or not, also what you are proposing goes against the spirit of bitcoin, which is that no can spend their coins without the private key, and if something like this were approved I can guarantee you bitcoin will stop existing, as at that point it would not be different than fiat at all.