I doubt that would ever happen.
You have to realize, out of all the branches of the military, the Navy is the most "conservative".
It is fine to lose assets in a combat theater because ECM grounds your observation or gun drones. But a carrier absolutely can not operate without fuelers. I know they are playing with them, and they can have a use say several hundred miles forward. But as the main (or only) refuelling system, they will absolutely never go for that. Especially as they are huge, and take up as much room on the hangar and flight decks as an F-18/F-35. Actually better to just use a Hornet than a drone, because at least if absolutely needed you can drop the fuel pods and it is a Fighter again.
I can see great use for tanker drones. Say 150 miles from a combat action, lingering in the event a fighter has to break contact because they have been on afterburner so long that they are low on fuel but still have ordinance. They can go to that drone, refuel, and get back into the fight. Or if they have a fuel leak from getting the wing shot up, such a drone could be rushed out to top them off again so they could return to the carrier.
But as a replacement for the human powered tankers that could not care less if somebody is pumping out a gigawatt of ECM interference? That is just not going to happen.
Good point. You only have X space on a carrier. It's not as finite as a ground installation. I don't see them taking the drone over the manned at any time when the manned can double as something else.