not allowing them to hear a TV for 3 years is such overkill and would remove them from being around many spaces
Otherwise, I don't really see your point, preschoolers rarely have access to TVs where I live.
I'd be interested to know if this makes children "text-blind" and relates to increased struggles with reading and writing as they get older. It seems a theme in 6-10 year olds from teachers at the moment.