Yeah, I'd love a 200 f2.8 L with IS, but I'm not holding my breath.
In the meantime, I got a refurbished 200 f2.8 L prime. I don't use it often, but when I do I really love it. I had one in the old days when I had an F1 and it was my second favorite lens next to the 24mm f2. 8. For sentimental reasons as much as anything else, I got the EF version. Cheap and well worth it.
I prefer that lens, combined with the 70-300 "L" to the 70-200 "L" because I tend to prefer the longer focal lengths
(I do wish it had better close focusing though)
Nothing quite like that wide-open (or near wide open) out of focus background to isolate a subject. It is an incredible portrait lens on a full frame. I am wondering, if you are shooting outdoor portraits and candids, why do you need IS.