Nothing’s perfect of course and it might be possible to get it very good by means of spread spectrum. But it’s going to be a people problem. Do people want pilotless craft among piloted ones? If you are piloting another craft, how do you signal a sudden problem to the controllers of the pilotless craft?
You’d use the existing method. Pretty much the only thing people are useful for on vessels now is respond to emergencies on their vessel or others. Send the SOS the radio will pick it up, which gets transmitted to the remote operator who then responds.
People will complain about it until the next big pilot error accident. That’s always what gets buy in on decreased pilot control.