The coppa laws are also country dependant, what is out there about the age 13 is what the usa class as a child.. A child in the uk by law is classed as 18. So the uk youtube could narrow down what is thrown in the direction of kidstube even more strictly (i can't see it happening older than 13 but its a possibility)
Kidstube still has ad's, they aren't personalised ads and also only on average about 2 per video.. These channels will still make money but not as much while they are sorting things out. The videos can still be viewed by adults on the normal youtube andany accounts where the age is set to adult age (when you sign up for a youtube/google account you put date of birth) These accounts will have normal ad's, and personalised to what google tracks you to see.
I have a daughter who has a youtube channel (Adult child) we have looked deeply into this and spoken to people about it too. Mr Ingham is delusional if he thinks they won't be affected by these changes. I also wouldn't like to be him if he is found multiple times not declaring their videos as aimed at children. They will lose their channel, past videos and a fine (if not more). Its best to declare in this case as its google who doesn't want to be closed down and will be cracking down very hard on people for not abiding.