I did a lot of research several years ago before purchasing my plasma. LCD technology is still trying to catch up with the image quality of plasma, but LED just might surpass them both. One of the main negatives with plasmas is that they have a more reflective surface than LCDs do...some plasmas have an "anti-reflective" coating but these sometimes tend to degrade image quality. Viewing angles are much wider than with LCDs. And "motion jitter" isn't as pronounced with plasma as with LCD. Plasma's (though I've seen some mention to the contrary) tend to be more expensive initially with their cost of operating nearing twice as much as LCDs. I love my plasma. Having said that, here's some thoughts...
Browse your Wallyworld, Bestbuy, whatever and compare the number of LCD vs. plasma panels. Wallyworld at times doesn't even carry plasmas. Looking online you'll see that LCDs outnumber plasmas by a large percentage. It's easier and cheaper for a manufacturer to produce LCDs than it is to produce plasmas. Not to say that the manufacturers have much pull with the state of California, but don't you think most of them will be happy to produce the more easily produced and less costly LCDs? Panasonic (which is what I own) will probably be the major manufacturer that this will impact being as they are still strong in plasmas.
Why were A/V receivers not included in the "ruling"? Many (most?) people add a A/V receiver to their flatscreen television for the "surround sound" effect. The very basic, entry-level A/V receivers chug along at around 250 watts...some of the medium level receivers kick in around 600 watts (much more than the televisions). Many people the A/V receiver to listen to music with the television turned off...it's still burning 250-600 watts with no television and some people listen to music all day long.
Anything that creates heat from electricity is indeed burning lot's of energy...resistive heating is one of the worst energy hogs of them all...incandescent light bulbs, for example (though they don't have the mercury issue that flourescents do). Hold your hand above the top of an A/V receiver...it's hot, I've seen some that you could just about roast a hotdog over!
People tend to waste energy by simply not using good conservation practices. A LCD burns a little more energy than two 100 watt incandescent lightbulbs, a plasma basically twice that much. A basic coffee maker left on burns a kilowatt+, curling irons and irons burn...1000-1500 watts (but thankfully most have auto-cutoff circuits these days). Typical desktop computers burn 60-150 watts...and lot's of us leave them running constantly. Ever left a room and *not* turn the lights off?....yeah, everyone of us has done that....the light should follow the person from room to room. Got anything hooked to a wall-wart?...yelp, steadily burning juice. TV has a remote...phantom power is being used by the remote receiver that's built into your tv, stereo, whatever (plug everything into a power strip with an ON/OFF switch on it and you can kill that phantom power sucker). Ever leave the tv on while you're not watching it? Ever leave the shoplight burning while you go inside to fix a sandwich? Etc., etc.,
I do agree that plasma televisions are much more of an energy hog than lcds...but lcds are still culprits. Kinda like "yes your honor, I tied the victim up but Bozo there shot him". The coffee makers, light bulbs, computers, etc., are all suspects to a degree. Will outlawing energy guzzling televisions save the planet...no. It will help a tad to decrease energy use, but the impact will be minor if other areas of use are not decreased.
California has a plethora of problems...health care (like we all do), gangs (that are out of control), illegal immigration (that the politicians are scared to address), a state budget that is bankrupt, energy, etc., etc.,. I tend to think that the television "ruling" is something that used time and resources of the CA government/people that could have been spent on more important issues...but this one was maybe attainable and the authorities can pat themselves on the back for making the ruling.
For some reason "wag the dog" comes to mind...
FWIW (which probably ain't much)
Ed