Been discussed many times and the bottom line solution is always the same: there is no solution. So choosing between the lesser of two evils, the best thing to do is upload sRGB.
I doubt you will ever see the ability here to upload separate print files and display files. But if you could, it would also open up other benefits - like the ability to place your own watermark on the display file. Not to mention the differing mechanical requirements of each upload, and the lack of understanding of same by some.
From FAA's point of view, I can see why it can never happen. On top of error-prone logistics, allowing two separate uploads opens the possibility of artist-caused image mismatches where the buyer does not get what they saw. There are a lot of great artists here on FAA, but to be unpopularly blunt, there are some technically clueless ones, too. If two uploads were allowed, it's guaranteed there would be problems. FAA staffers already have too much to do without adding the responsibility of following up on, and verifying each upload set to their tasks.
Edit: there is one thing FAA could do, tho. A change in code to modify the aRGB upload to sRGB when creating the display image and leave the aRGB hi-res original upload unchanged. That way any printing vendor that uses aRGB would use it, and any that uses sRGB could modify. There could be a slight mismatch between what the buyer sees online and the print, but I doubt many buyers would complain about it.
