I'm actually mostly ok with the new layout/design. The Photostream now matches the iPhone app, which I am used to and works decently. I find the Contacts > Recent Photos layout to be the most useful for keeping up with everyone's activity, and I pointed my bookmark to that view.
My beef is with keeping it ad free for myself and my viewers, keeping the stats functionality, ability to replace images, etc. - i.e. the Pro feature set. I'm going to wait and see how (if) they address grandfathering of non-recurring Pro accounts (mine currently expires in September), and in the meantime, I'll be looking into 500px, SmugMug, and Zenfolio. Leaning toward 500px ATM.
EDIT: digging more into 500px, I may just port over there regardless of what Yahoo does or does not do with Flickr Pro (besides saying that Pros don't exist anymore, which hints rather strongly at what they won't do for Flickr Pro users).