Question for someone who has the knowledge on POS / POW.
What happens when the hashing becomes so low on POW that POS is the only thing securing the coins? Is this a likely event? How secure would the system be then? Can the coin survive solely on POS in a secure manner?
Yes a coin can survive just on PoS. It can be secure, depending on how much coin weight the network has. I still have no plans to remove PoW. Will reevaluate as time goes on.