Bitcoin cash will be a hit but i don't think it could replace bitcoin. It will just crash like other altcoinsat the market. It's better if buy only the half of your portfolio because most of us don't know what's gonna happen after August 1. Honestly, im more comfortable on buying altcoins right now. The market is getting more stronger. But it is impossible that bitcoin will fall down to zero. Im telling you that because only few are in favor to BCC.
It is possible that BitcoinCash can rise right after August 1 but just like you I also doubt if it can be able to hold on with its newfound glory as it is possible it can also be a victim of a mega dump. Some are calling it as a free money but does it mean that if you have a Bitcoin you can also have an equivalent amount of BCC in a supportive wallet?
Now, in wallets that are not interested with BCC, does it mean that their users will not get any BCC but just be able to retain their Bicoin?