Will they work in tandem? What on Earth will happen???
The free market will decide!
Right now, Bitcoin Cash is raging, listed over $600 on CoinMarketCap and over $900 on Bittrex!
For all the hullabaloo leading up to the hard fork, now that there are two separate coins trading, buyers and sellers will actually be the ones to determine the value of each. Bitcoin is holding fairly steady at $2700 and the alt-coins are a sea of green.
So, it appears a bunch of fiat money is entering the system, perhaps folks who were waiting to see the hard fork happen and then get their toes wet.
The overall crypto market cap is up about $10 Billion from this time yesterday.