It is very interesting what Palnet are doing with curation. I make it a point to search through Palnet content before other content to curate because of the higher curation rewards.
Will 50% split be sufficient to significantly increase curation? For me it is but for others I'm not sure. Currently, voting on Palnet also votes with Steem. So, curation rewards will still be lower than 50% for Steem and Pal stake combined. That can be worked around by voting with an alt account on Palnet.