The idea about PosP is interesting but since there is competition between open wallet, those who have few coins cannot compete against those who have large stash. I believe this only benefits those who have huge bag of CBX. Not a small holder friendly. It is not participation but rather competition.
POSP does not favor large portfolios.
If 20% of the wallets staked. The staking yields 10%
If you have a $ 100 wallet you earn $ 0.83 per month.
If you have a $ 10,000 wallet you earn $ 83 a month.