Ditto. I still enjoy my XT, but geez, that thing is tiny after carrying the 1D around for a while.
It's too light, the screen is itty-bitty, the viewfinder is cramped... Yep, I got spolied in a hurry. 
Like the other guys have said, if that's the camera you want, buy it and use it. I can tell you right now there's something new coming. What it is, I don't know, but there's always something new coming.
If you buy the hottest 4Ghz gaming PC you can find right now, in ten months there'll be a 4.8Ghz. And after that there'll be a 5.2 Ghz.
I bought a point-and-shoot six years ago, when 1.3MP was not far off from top of the line. Within a year they had 3MP, and a year after that there were 4 and 5MP.
The 1D won't stop taking pictures the moment a new model is released. It'll keep working for as long as you take care of it and keep giving it batteries and memory. There's still hundreds of people using D60s, 10Ds and even first-gen (non MkII) 1D and 1Ds's. There's still people using the old Kodak/Canon first-ever SLR digitals, even though they're only 3MP.
If you need, or want, something currently on the market, buy it. As above, you can't take pictures NOW with a camera that doesn't exist yet.
Doc.