Dialet speaking shows

Some local productions have dialet speaking dialogs. So does that mean authority on media have relax on languages involving dialets? Mandarin was the key language aim to merge everyone when communicating. But the elderly have problem speaking Mandarin. Now that movie can have some part of dialets why not allow cantonese dramas? Perhaps we have not reach that stage yet. They could allow dual sound like those Japanese and Korean shows. Don't think they will do it because everyone will switch to listen to the dialet portion. So it seems it will be a longer way to go for dialet TV.