bch is a joke. exchanges bch walltes offline so ppls only can trade it and not deposit outside. as soon as ppl can cash it out it will be dead and just another altcoin
Some exchangers really haven't option of deposit of BCH (or BCC), but there are those who allowed that. In particular, deposite and withdrawing of BCH is opened on Bitfinex, Bittrex, HitBTC and ViaBTC (from the 1st of August).
That fact that the price for BCH is constantly going down doesn't mean that the fork has failed. I think that was just nonsense to BCH's price reached such highs in the first hours after it's appearance. Now everything will stabilize and Etherum will go on the first place again.