Crytopia says
SC / BTC market is closing
Due to ongoing transaction issuesSiaCoin(SC) has been scheduled for delist, please close all open orders and withdraw your coins before 24/09/2017
Cryptopia SC/BTC 0 BTC in the last 24 hours.
Yes we need more markets to accept this coin, but this does no affect the numbers
I guess if that's the hope we're looking for, it is dead.
Cryptopia had a daily total volume of less than 2000SC

You can trade your Sia on Poloniex (not recommended due to their problems handling withdrawals), Bittrex, Shapeshift, Yunbi... Do you really need more markets, guys?
With such tiny volume on this exchange it would not be worth it for them to host it on this exchange. It can be a lot of work for an exchange to host a wallet, and SC is a more complex wallet than most. No big deal IMO.