I guess that would depend on what you have to shoot with at 200mm currently.
For me, I would just save and wait for the 1D X. (Yes, I'll be the idiot that deviates from the norm.) I have the 7-2/ii. Though it's not the mythical 200Lis, it's not TOO far behind. It's more versatile, and easier to lug around.
As for the 1D X, I get to enjoy its quality and features for use with every... single... photo I would be taking with it.
With the 200Lis... well, unless it is the only lens I own, which ironically would be the case in order for me to own a 200Lis
, I can only enjoy its magical photos when I am using it for specific purposes.
See where I'm getting at here? eh? eh? 
But I think I'm going to wait awhile before I pick up a 1D X. Let the brave souls to be early adopters this time. I'll feel more comfortable ordering one after the new 61 point AF has been tried out, after the iso Eleventy-billion is squared away, and after it's shown that the 12fps can hold up.
I am rather confident that it's going to be a superb camera, and I plan to eventually get one. Of course... I might change my mind between now and March and be another early adopter sucker. That worked out okay with my 7D. But since a lot of people are putting their names/deposit in at stores already... it's unlikely I could find one for at least 6 months.



