You're probably right, but it depends on how quickly neural net accelerators can be miniaturised. Making an autonomous fighter jet is not as simple as setting a UAV to cruise control and having a script constantly hitting auto-target and auto-fire. The pilot replacement needs to be an AI with a highly sophisticated ability to filter patterns out of sensor noise, quick reactions, high radiation tolerance, and it needs to actually fit into the airframe since remote control just won't be good enough. There are some things the human brain is still better equipped to handle. Only with datacentre levels of compute can AI mimic that, and right now the life support and chair are less weight than the minimal amount of compute needed to replicate everything a pilot may be called on to handle.
If Taiwan blows up, 6th gen will be manned. If Taiwan stays intact, China has autonomous 6th gen within the decade and the rest of the world maybe by 2040.