Until mobile phones get 19" LCDs, why would anybody want to watch TV on them ?

Car TVs, permanently fitted and viewable from the back seats, might make more sense.

Where would one use mobile TV anyway?

At home? Nope, anybody with the price of one of those will have at least one regular TV already installed.

While visiting? Nope; if an important show is on, you can ask your host for the use of their TV; otherwise you can act like the antisocial type who, in the old days, would sit in a corner and read a book.

In a car? Illegal for the driver to do it in most countries. For passengers, or when parked, in-car TVs are already available.

In a pub, club or restaurant? Many of those places make their own arrangements, and have big screens and big sound systems to prove it. Other, quieter venues may well chuck you out for bothering the customers and putting their license at risk.

In a park or on the beach? Why go there in the first place? Stay home and watch TV, if that's what you want.

On the street? Gotta be kidding. A sure-fire way of getting mugged, at least while the thing is fashionable.

For bling purposes? Maybe, but it won't last, and it won't make a sustainable market.

My old mobile died some time ago; the next one will only have to do voice and text, and will be as cheap and reliable as possible.

No fancy stuff required, although GPS (or Galileo??) would be neat.