It completely depends on the reason of why it crashed. If it's just plain 'ol market volatility, then sure, chances are it will rebound back up in the future. But if it's something like the developers abandoning the project(which is very very unlikely in my opinion) then it might not recover if no one is going to continue to work on the project.
Yes depending on the cause of the crashed. The rise and fall in bitcoin prices is highly dependent on some of the news that comes on cryptocurrency especially bitcoin. Because if it is only caused by some companies that do not use bitcoin as a transaction tool or some country prohibits bitcoin as a means of transaction it trusts some investors that bitcoin will not be worth anymore. Even in situations like this is very wanted by some investors to buy bitcoin because the price is cheap. But if the cause is caused by the system of bitcoin itself it is likely that users will sell and make bitcoin no longer valuable. While today the cause of the decline in bitcoin prices is only caused by some companies and countries, I am still convinced that bitcoin prices will recover again.