Your post seems to be more of a rant than a question, but let me attempt an answer anyway (might be convoluted).
First of, what kind of crap have you been watching? The thing is, there's low and high quality content in every media. The best match for your description are daily soaps and, to some extent, reality TV (note this also differs from country to country). Those aim at overloading your senses to hide the fact that the actual content is very shallow. Kind of like trying to make a bland photograph more interesting by making it black-and-white, adding a vignette and stuff like that. It's the same with depth of field. A shallow DoF can be used to highlight fine detail such as facial expressions, hand gestures et c. That wouldn't really work in a show like The Big Bang Theory, where you are bombarded by a staccato of one-liners and audience laughter.
If you see the same thing on YouTube, it might be a Monkey see, monkey do effect. Most YouTubers have not had a formal education in videography but have learned the technical aspects of it (i.e. using the editing software et c.) by watching/reading online tutorials and neglected to learn anything about aestethics. So they just duplicate what they've seen on TV. This is why there's a lot of crap on YouTube as well.
This may sound overly negative, which isn't actually my intention. It can be argued that though formats like that may seem cheap and badly-done to video editors or video artists, the goal of those TV stations is to make money. And if those formats are what their target audience wants to see, you can't blame them for producing that kind of content. Same goes for YouTube. If they have success with it, who are we to tell them they do it wrong?
On the other hand, I don't think the overall quality of TV shows is going down. This may seem the case if you only watch cheap and quickly produced reality TV or daily soaps, but there's also a lot of high-quality programmes. For instance: House of Cards, Breaking Bad, Better Call Saul, Game of Thrones. Those all have intricate plots as well as high-quality videography and editing.
One example for this (WARNING, Breaking Bad season 4 spoilers ahead):
The final shot of the last episode zooms in on the Lily of the Valley in Walter's backyard, revealing that it was Walt who poisened Brock, not Gus Fring:
Breaking Bad Season 4 final scene on YouTube
Admittedly this is not the best example. Watch House of Cards, they play with depth of field a lot.
There's a theory laid out in Steven Johnson's Everything Bad is Good for You that concludes that the general complexity and cognitive demands of TV shows is going up, not down (as is often suggested by certain media outlets). The reasons for this are too complicated to reiterate them in this post, but I highly recommend reading the book if you are interested in the development of popular media.
tl;dr: You wouldn't read The Sun if you want high quality journalism. So don't watch cheaply and quickly produced shows that are intended to be easily consumable if you want high-quality videography.
tl;dr the tl;dr: Go watch House of Cards.