No doubt that wild Oud is on borrowed time. I think that some cultivated oils are bridging the gap, such as Aroha Kyaku, Oud Mostafa No. 5 and some of the offerings from Adam of F.O., even though nothing cultivated I have tried is at the same level as the finest wild oils.
I suspect that there will be a niche market of cultivated old, naturally infected, mature trees using artisanal distillation techniques that will result in high end expensive oils. Market forces will obviously dictate such things.