Rumor: MPC will go way of PPS
I guess the rationale behind this new revenue based tiers is to drive more revenue spend for their loyal customers and to not alienate those that do not spend as much to still be willing to fly CX even if it means no status for them.
Under this scenario, those last minute purchases of any class or any non-restricted fares or pure J/F flyers would be their target for the new elite tiers. And those that mostly travel on less AM accrual lower priced tickets would probably start to see only AM accrual rather than MPO qualification.
At the end of the day, everyone still gets to earn/burn their AM, but only those that contribute certain amount of revenue would be granted status.
This is what I would do if I run the airlines!