I can't speak for the US or Canada, but the BBC, Sky 1, and Virgin 1 all showed TNG in 4:3 in the UK - at least for the episodes I caught. I've tried watching a couple of DVD episodes using my TV's zoom facility to crop the picture to 16:9, and the result - while not disastrously bad - required up and down scrolling to keep the action and people's heads framed in view. It also served to hide Jean Luc's shiny, bald pate for some of the time.