I've always felt that the 144,000 number was symbolic given the context of where it was mentioned in Revelation. The pressure must be really high for them to flip this key doctrine.
I don't buy the notion that the DOs will be retired early or made into COs. It is not in their best interests to de-centralize or weaken their bureaucracy.
Dissolving the DOs means dissolving the districts too. Dissolving the districts into circuits will make the zones unmanageably large, and the ZOs overworked and spread thin. Unless they want to dissolve ZOs and their zones as well. Either way it will cause the COs to be more affiliated with the congregations than with the WTS company, the congregations to becoming more autonomous, and the local body of elders to becoming more powerful and autonomous within their congregations. A real political power shift!
If the COs are made to fend more on themselves, they are going to court more favor with the congregations and build allies with those that will support them later in their old age. After all, they have their wives to consider too.
It's not going to look very good. So I'll be surprised if this DO thing happens.