I likely will. I just sold my 70-200 VR1 and may end up picking up a 70-200 f4 later this year. I like having lighter and the speed difference isn't much of an issue for me. Although if the rumors turn out true for this year and the 80-400 is refreshed, I'll definitely buy it over a 70-200 any type.
LOL, just looked and I changed my answer from last November. I think it's because what I shoot is changing so much. Just don't need to have a lot of money sunk in an expensive lens for a range I rarely use now.