SBD is not being eliminated in Hardfork 20. It will continue to function as it has before.
Post payouts not coming in SBD anymore is related to how much SBD exists compared to the total market cap of Steem. This will likely change as the Steem price does - either it will rise and the market cap will rise with it, or it will fall and people will start converting quantities of SBD to Steem which will reduce the supply. Either way we should eventually start seeing some payouts in SBD again.