It probably will happen over time as entropy does its thing, but the structure is different than what you describe.

For one, Howard is not the successor, Greg Abel is. Howard is a Stewart of culture, but he is not the leader.

He also isn’t inheriting Buffetts fortune so the generational rot won’t be the same.

Next, both Greg and Howard have been at Berkshire for decades, and however is next up will likely be similar. So there is time to pass on the values.

Laslty, Berkshire is a decentralized company. The company itself has less than 50 employees. All of the companies they own have their own leadership structures and cultures, and Berkshire does not burden itself in managing it. This makes the successor problem a lot easier