50/50 would bring quite a lot of change towards the vote-selling economics. Especially in combination with cheaper downvotes / seperate manabar for downvotes.
This will result in more quality control regarding promotion as with downvotes, the profitability of the services is being attacked.
So in that sense, a 50/50 change (or another ratio higher than now) would actually be good for the quality aspect of content. Especially since it would be more relevant to vote for good content instead of bad, as downvotes could result in a costly mistake (less or even no curation rewards)