Good point. There are some initiatives to bring them to surface, but that's too little for the vast majority of them.
I might be wrong, but by doubling the curation reward, people will choose to go even more than before where it's more likely to get rewarded more, instead of upvoting what they find and like.
I am not sure I understand the currency suggestions, or who is suggesting it, but I read @exyle's post and I agree with him.
P.S. I resteemed @exyle's post.
Yes, that is one of the questions being asked to witnesses, if to change the current linear reward system with a superlinear one. The witnesses seem to agree this is a bad idea (for now).
But there are other changes they seem to agree would be good for the ecosystem. You can see them all (and their votes/comments) here:
https://steemit.com/witness-category/@cervantes/witness-consensus-status-to-fix-the-actual-steem-s-economic-flows-eng#@exyle/re-cervantes-witness-consensus-status-to-fix-the-actual-steem-s-economic-flows-eng-20181027t063352750z
@exyle makes a great point, that this should be changed at the SMTs level, and there's no point in even discussing it before SMTs are out.