There's some interesting comments at https://www.reddit.com/r/BitShares/comments/73ynmq/bittrex_to_remove_bts_on_october_13th_2017/. In particular, the ones about Ada. I did take the opportunity to look into Ada; it looks interesting. I ended up buying some. I've also bought some more BTS as well. There were some great BTS loan offers on Poloniex several hours ago; if BTS drops down again I expect there will be more great offers.