I think the answer is to set clear rules for screen time:TV/Computer/ Games etc. from the start. So from when tiny and watching TV to only allow a maximum time at one sitting!
I can see how easy it is for busy parents to fall into the situation of almost continuous screen time. I now a family who has been consciously 'weaning' their kids off screens! They have stopped screens for the hour before bedtime and have specifically planned alternative activities that they, the parents, will get involved in: board games, reading, crafts & homework etc. between 6:30-7:30. Eventually they plan to limit the time per hour that their kids can be watching a screen but know initially they have to make themselves available to guide alternative activities until it all becomes habitual. Fortunately at the moment my DGC are not too screen obsessed..though they do love them!
Shall we reboot our cartoons thread again? 😁