It's funny, I've used the 5D quite a bit and I thought I'd really lust after one for myself, but in fact, I preferred my 40D. Now I have a 1DM2, and I'm in love with it. The bulk and size aren't smashing, but the focussing is outstanding, and I love the tones it produces.
Anyway, Canon now have to respond to the D700, though they couldn't have waited on its release to make any critical decisions, simply because of the amount of time it takes to get these things to market.
I too, wonder, if they'll bring out a 3D, and drop the price on the 5D. This would mean that for the same price point as (or slightly below) the D700, they'll have their new kick-ass FF body, and then they'll be able to attract other people who want a budget FF body, with the 5D at half the price.
For enthusiastic amateurs, and pros alike, the 5D is still a superb camera, and the only area it lacks slightly, is in the autofocus, but it's still more than enough for weddings (it's one of the most popular wedding bodies), family etc.