I would not be surprised. They simply can't afford to pay them. They may attempt to replace COs with local part-time travelling overseers. (Basically using stand ins permanently) That's if they can find enough people willing to do the job for free.
They may try to get local congregations to pay them, but I doubt that would work either. What happens when circuits don't contribute enough to support them? Which is a sobering thought really. Most churches afford a paid clergyman per congregation. JWs struggle to support one (very poorly) paid minister between 20 congregations.
It would mean thousands of JWs who unexpectedly need to support themselves after giving their lives to Watchtower. A recipe for a lot of discontentment if true. How many COs worldwide? If there's one for every 20 congregations that's around 6000 worldwide, plus wives, allowing for some singe, around 10,000 people.
DOs were already abolished a few years ago. Can you clarify what you mean about DOs?
If Watchtower suddenly abolished COs won't this be proof (as if we need more proof) they are in real financial trouble. Or will skeptics still claim Watchtower is in robust shape with billions of dollars to spare?