I remember you saying this before and also agree with you. Sending author rewards to @hive.fund and/or @null would be a way better solution than the one we have today and maybe more people will use it.
Right now there's a lot of confusion about cross posting. New (and old) users don't really understand what it is. I've seen many saying I've used cross posting but has not benefited me at all. When I asked them what they meant, turns out they were expecting to be paid for each cross posting, which we know will never happen. Some however are using cross posting like crazy, cross posting their post in 3 or 4 communities, each time. While limiting the option would not be smart, I still think there should be a healthy balance and it would be the users responsibility to use it wisely.
Back to changing the current declined reward system to sending rewards to above mentioned accounts, I don't see why it should not be implemented. I know it needs some work, but it would benefit the chain long term a lot.