If bitcoin dies , Zcash will up and running the show. It's just a matter of switching to an alt coin.
For sure everyone will have to migrate to another coin to continue but it is probably hard to believe if bitcoin really dies, what about the people holding thousands of bitcoins in their wallets and what about the ones running exchanges and other websites with bitcoins? They would surely cry all day and then move towards something else.
According to me it would never happen because Bitcoins are now blood of online business. Most of the sites are running only on Bitcoin.
If this happen many people lost their business and it would result to biggest loss in the history of online business.
yes that is a fact that now bitcoin is becoming one of the most important part of our life, people are even depending on it for life, therefore i also think that it may not be so easy that bitcoin will die.