To create physical bitcoin doesn't look a good idea, because it's not supposed to work like this. Bitcoin demands internet access, so people can deal in real time person to person, without involving any central middlemen and barter systems.
A holder of bitcoin cash is not restricted from cashing in if he wants. No one is stopping him. Bitcoin cash simply allows the use of bitcoin offline. It is even environmentally friendly because offline transactions do not require electricity - which has been a big concern lately.