I wouldn't be opposed to instancing actually, but if they were to be a thing I think there would need to be a lot of baddies and a lot more baddy areas or dungeons, l which is possible. Similar to those areas that need a certain amount of hours to enter, but instead of that it could be based on baddy kills or perhaps a completely new statistic or attribute.
I think that would be cool, because then you could make areas with increasingly more difficult baddies, something that require many players to kill, akin to the blob, or just experience in general. With instancing areas, you open up another possibility for reward-based Bking besides just the bounty. These instanced areas could be different from bounties since normal bounties wouldn't involve these newer, different baddies. The rewards could range anywhere from gralats to maybe even accessories or hats/helmets. It would make Bking a more interesting activity IMO, and I'd have fun with such a system.
We have areas with different types of baddies everywhere. Here's a personal list from easiest to hardest, excluding special baddies for now.
•Balamb Rebel Soldiers
•Normal Rebel Soldiers
•Red Spider things