If they are a true cryptocurrency exchange then they should be offering more coins. If not they should be just called a bitcoin exchange. As a trader I would prefer a lot more options than just sticking to what is the mainstream one. I know there are traders that only trade BTC/USD but I think there are a lot more money to be made with other pairs.
I think Gemini is a true cryptocurrency exchange. It`s a lot older than new one`s, like Kucoin or Binance; Geminini provides service from 2015. In 2016 Gemini became the world's first licensed ether exchange. Maybe most of average traders may never heard about it, because it can charge larger fees for their service, but this proposal may be quite acceptable for institutional investors. Big whales, long term players may pay much more money for the safety of their assets. Just think about it, have you ever heard about funds stolen from Gemini? I'm not.
It is good exchange. But if it accepts Bitcoin Cash, will it be boycotted by many core supporters?