I have advocated for a year or more to let authors set their own curation rewards on a per-post basis. I very much doubt if there's any "one size fits all" value that doesn't suffer from some sort of malincentive. But I agree that 50/50 would be preferable to what we see now.

I was intrigued to see, here that Golos now has a bot that provides custom curation reward percentages without a need for change at the block chain level.