We need to remember that the ILSAC ratings, GF-5, etc., primarily apply to fuel economy. All other attributes of the oil can be spec'ed by the API Service Category. The upcoming SN will include 10W-30 oils and the rest.
As a consumer, I do not want individual manufacturer's specs for oils. I want all the spec's rolled into the Service Category so every oil of the specified viscosity is right for my modern engine.
bepperb, what's wrong with the present amount of ZDDP in any modern engine? And, no one is considering removing 10W-30 from the shelves, just removing the Energy Conserving label from the bottle for consumer clarity. For the small number of older or modified engines that need more wear protection than GF-4 oils offer, more distribution of CJ-4/SM 10W-30 would be one answer.