A better Lost Coins recycling program:

Instead of losing all 50,000 coins at once if someone forgot about it for 3 years...

Make it so you lose only 10% of coins that's been idleing for 1 year

so an address with 50,000 coins would have 45,000 after 1 year, 40,500 after 2nd year... and so on

if this is indeed lost BTC, eventually it will gradually be redistributed into the econ again...

if this is someone's idle address, he would still be able to recover more than half of it after 5 years.