I have three 4K 27" which yield a bit more screen real estate. Otherwise I'd love to go to a single ultrawide.
Although for sim racing I've been thinking about getting a single ultra wide and high refresh rate monitor, but I'd probably go for a dedicated setup with a seat, monitor and speakers. It gets pricey, but cheaper than crashing IRL.
On the flip side I would love to get rid of physically managing three individual pieces of hardware that wasn't made to work together as one setup.