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I guess but does it make sense to target the viewing audience for those viewing under very poor conditions (lo-res, small gamut (many tablets and laptops are actually FAR sub-sRGB gamut even), poorly calibrated)? Landscape photos perhaps scream for larger sizes more than any. Many entire classes of nature photography, especially texture and detailed based shots, don't even work, so you end up with 100% grand scenic vistas and nothing else posted.
You are preaching to the choir. I have no idea how to reach such an audience that has controlled large size viewing.
When I was in Camera club in Spokane, they showed images on a projector at 1024 wide and it had lousy color casts. But we also showed prints, I only ever entered prints. In Salt Lake, they did not have prints and again showed at 1024 on a projector. I eventually dropped out of that club.
I use 1600 at home on a good monitor and use my monitor profile. My view is 18 inches wide which is less than my display but still a decent size. But this is already 5 years old and will soon be old hat.