Yeah, something like that has been suggested before, I think, when the forums were still... well, real forums that had a section for feature requests. I can't remember if that suggestion was approved or not, though.
Giving the whole account away to someone who wants to play is often a problem, too, especially when only one character on the account is unwanted and others aren't, since there is no way to split a single character from an account. And something that could also pose a problem is that when taking over somebody else's account, you'd be able to download the life logs of all deceased characters on that account and some players wouldn't want strangers to read through their characters' lives.
So it would be really great if there was an option to abandon a single character on an account and automatically give it to the next person in the queue if it's still a baby. And for an adult no longer wanted character maybe an option to just send it over to the account of a person of your choice (since it's mostly not a very good idea to hand older, already established and maybe even powerful characters to a random person... if at all, that would have to be somebody hand-picked by the player. It's quite disturbing if a character's behavior suddenly changes drastically, so the new player of an adult character would need some kind of introduction from the old player, too. Since all of that is quite complicated, players often prefer to just let older characters die instead of handing them to another player.)
Oh, and it seems one of the babies isn't inactive after all.
The player sent an OOC message that they do intend to play the character, just had some technical problems before that prevented them from writing.