Who cares if a TV is not supported. Even now, it is way too expensive to fix anything in any of these TV's.
If HD-DVD is not supported in the future, they put out no movies, so your player is worthless. If they stop supporting the TV, you still have a TV with the same inputs as any other TV you would have got.
The opposition is because I disagree with his advice and I am trying to cut down on the hype.
Main issues with plasma: Burn in is essentially a thing of the past. If you are worried, put on a dynamic signal when you take a leak, it takes a lot longer to burn anything in than you can hold it for. If you are stupid, you can still have burn in.
Lifespan: old plasmas would only last a couple years, but the current generation of Panasonic (and several others) is 60000 hours, or about 20 years at 8 hours a day.
Glare: The anti-glare coating makes this better, but it is still not as good as LCD, but even uncoated sets have less glare than CRT's. If you have a window directly behind the TV, it may be a problem. My roommate owns a 1080p 42" sharp LCD and he has said that my 50" Panasonic plasma has a better picture, and I paid less for my 50" than he paid for his 42'.
I think that the better black levels and significantly higher contrast are worth the trade off. The picture is better, I've even had LCD lovers tell me that.
Let me end by saying I do not think Plasma is the be all end all. I think that if you have a 1080p source, it is easier to find a good 1080p LCD at the right price than a 1080p plasma. If you have no 1080p sources and don't plan on doing anything but watching TV, do not waste your money on 1080p.