If someone really has the wealth to do things above, I don’t think he’ll choose to do that in view of the fact that his success in attacking Bitcoin network would devalue Bitcoin instantly and gravely for the premise of the existence of Bitcoin is the temper-proof feature of data in blockchain. Otherwise, the value of Bitcoin would go zero directly, then the one who suffers biggest loss is absolutely hacker who spent great cost in attack.
As long as the attacker is being rational. It's different case if the attacker don't care about loss-loss situation, although i think it's very unlikely.
Yes, this is why I think Bitcoin is so powerful. In the Bitcoin ecosystem, it is not only the Bitcoin code that plays a role, but also the game theory's grasp of human nature. Game theory takes human nature into consideration in the Bitcoin system. When human beings do anything, they generally seek to maximize their benefits. All follow rationality. And rarely do things that are harmful to others and not good for oneself.