They really should just do a Kids season and have it be for vocalists under 16 or 18. Then they should raise the age limit for the regular seasons and let everyone else compete.
As much as I think that Kennedy, We, Danielle Bradbury, Sawyer, Jacquie Lee, et al had great voices, I also think they weren't ready. Having a good voice isn't all it takes, and in all of these cases the singers lacked emotional maturity, depth, technique, and consistency. Look at Brynn from last season - in the span of a single song she'd go from pitchy and awful to sounding really good. And her performances were all over the place. I'd much rather watch more seasoned artists who have been doing this for a while. People may not like someone like Dave, but at least he's always on key. I'd much rather listen to someone who has flawless pitch and knows their dynamics for every single performance, than a 14 year old girl who gets lucky here and there, but doesn't know what to do with their voice yet.