The word 'soon' is probably not suitable in this case because as I have stated, the 4th burn was literally around 2.2% of the previous existing supply

Most of the burn happened in the past when bunch of RLB was worth close to few dollar and people werent even considering it to be anywhere close to it being valuable hence alot of RLB was collected thus burned. RLB worth more right now so most people are actually keeping it instead of using it for lottery and aside of that, I believe most people sold their stash of RLB already so yeah its going to be a while until the whole 50% supply is burned