Showing things off on the extremely high-DPI display wall in your living room 10 or 20 years down the line. Film is going to do 'better' here because grain at least looks aesthetic blown up, however pixellation will be 'retro' by then. Especially if someone picks up on random sampling as an artistic image compression technique (sample a 'grainy' scatter, then compress that) -- but we won't need to because storage is scaling like the dick ends for now.

-Cropping after the fact. This depends on how you imagine your photographic workflow to go, but the ability to take a full-frame and then sample from it after the fact gives you a lot of freedom, especially if you want to do candids and motion and things other than rocks. One thing to keep in mind -- image rotation algorithms are often lossy, so hold that thing level if you want 'esoteric' detail. (Look up "PanoramaTools" for some demonstration of this.) Anyhow, this brings you back to actual glass -- if you want to be able to blow up 1/32nd of your image to fill your display (which will be doable eventually-shortly), you want to make sure it's going to be sharp and not fringy or any of that.

If you just want to take carefully composed pictures of textures, I think you're cool treating the thing as a miniature view camera and just getting enough megapixels in full-frame to satisfy you on your eventual 50" Cinema Display. Especially if you're Rands and can afford crap like that.