A wider AR for TVs was considered, and ultimately rejected, when the current 1.78:1 standard was adopted for HDTV. I'm not aware of any recent efforts to establish a different standard.
As Michael said- the 1.78:1 is the standard. But, while you can't expect any traditional sets to be this way- it is a more common thing for running a front projector.
Some guys use a constant height system, and have zoom modes, or lenses to project 2.35:1 onto a 2.35:1 area screen- and then just reduce width (keeping height constant) for 1.85:1 and 1.33:1.
Why wouldn't the industry have chosen 1.85:1, instead of 1.78:1 ??? It would seem to have been a more logical choice since many DVD's are 1.85:1 format.