if in my opinion the presence of a bull and a bear is not by stopping using binary and bittrex exchanges, and in my opinion it also depends on the user or big investor, because the investor has a big impact on the market
all indeed depend on the user and the interests of the market. When they are comfortable and safe with an Exchange does not exist is no reason to close them. when trading activity still going on and still the presence of investors in it all looks secure.