There are still many DLP and plasma sets available. LCD certainly hasn't come far enough to push them out of the market and it will be a while before it even gets close. LCD is far from being cost effective in larger screen sizes compared to DLP or plasma. Sony's 70" XBR LCD costs $30,000.
Weell LCDs are good in the 52" or 54" size. The Sony KDL-70XBR3 actually retails for $32,9999.99 It is analogous to Ford GT-40 at $150,000 it shows off technology, but is not meant for sales to the masses, but not many Ford buyers are in the market for the GT40 either.
I will give up that in the range 60-72+ inches LCD does not currently fit in an DLP and other projection systems come into play. There are trade-offs on all technologies, but as you get larger and larger you tend to lose sharpness and color saturation. LCDs have better color saturation and better sharpness than DLP at a given resolution and the DLP picture does not appear rich and vibrant.
The persistance of LCDs has been improved so that fast motion is not longer a problem. However, they are still not as good at deeper blacks as Plama. According to one blog about 2008 CES, Plasma is giving way to LCD.
http://blogs.zdnet.com/Ou/?p=948
But if you want really really big get a Panasonic TH46PXZ850.