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?
There is nothing you can do about it. Anyway 5 years is a short amount of time, for sure we don't have 4.5 mln of bitcoins lost forever, many of them are just sitting in the wallets of some real hodlers. There are addresses without any transaction for the last 10 years and then suddenly the bitcoin move, so what you're asking could even be dangerous because it would suggest to take the bitcoin from someone who didn't actually lose them.