I am a budding electronics geek! I shop for electronics goodies constantly even if I am not buying I still go to electronics stores to look at the latest stuff.
I have noticed that the selections of TVs in these stores is starting to edge more and more to widescreen. In fact many of the Electronics stores I go to have MORE widescreen TVs than regular 4:3 screens. Yes they are still expensive mostly (Though you can find many for around 700-800 bucks) but consider that the prices are dropping rapidly it figures that in the next 5 years the 4:3 screen will be the exception rather than the rule.
BTW if anyone is looking for a new widescreen TV I suggest forgoing Plasma and taking a look at DLP or LED. I Purchased a JVC HD-52Z585 that has a stunning picture and unlike Plasma when the picture starts to fade you can replace a bulb rather than buy a whole new TV again.
Oh, and if widesceen TVs become the norm then FULL Screen DVDs will show black bars on the sides of your screen unless you use the STRETCH setting (Usually called Panorama) I hate FULL SCREEN it sucks to the MAX!
Depends on the content. El Mariachi I'd much rather see full-frame than letterboxed, since it was shot on 16mm with video transfer in mind. The letterboxed DVD often crops the top and bottom quite inappropriately.