The general trend is to reduce or eliminate metallic compounds (but not immediately) with the obvious reduction in metallic ash and an increase in fuel efficiency.
Alleged reasons for reduction are cat poisoning and valve deposits.
There are generally two classes of organic FM and AW's:
1. Polymers including PAO, ester, and Liquid Crystal polymers
2. Ceramic and carbon nano-particles suspended in a carrier oil.
And yes, some of the above are being used as organo-metallics are being reduced.