I think they didn't want to ruin a perfectly good ear. But deaf ears are already ruined in their eyes.
They are concern because they discovered that children with implants at 12 months still struggle to keep up with their peers. So their solution is implant earlier. I wonder what they are going to do if they discovered that 6 months and 12 months don't really make that much of a different AFTER both group reach to high school (I know it seem like they are doing well while they are children). Then they will have to accept the fact that implant is just an implant and not a substitute for natural hearing.
Anyway being deaf is not a bad thing. They don't need to hurry.