I think my dream set up would be a 27" 1440P (What I currently have at home, with a pair of smaller (19" maybe?) 1080p screens on either side setup in portrait. Basically a similar screen area to 2x27", but without a bezel right in the center of my field of view, and the 1080x1920 screens will be a good size for displaying full page (e.g. PDF) at more or less full screen.
I actually like having multiple screens. I know I'm weird in this but I actually like running certain apps maximized.. but I wouldn't want it maximized across a whole ultrawide.
Plus, if I take a working vacation somewhere it's a lot more practical to schlep around one 24" or 27" than an ultrawide.
Also, just as an ergonomic thing, I could angle in the two outer screens a bit while not having one of those icky curved screens.