I live the length of a good par 5 from the course and can tell you that the club has been aggressively acquiring property beyond the confines of the National grounds. They have been buying private houses and businesses in the immediate vicinity of the course, in an effort to ensure that not only the course itself, but also the immediate neighborhood remains of a suitable standard.
An acquaintance whom I often see in the local barber's shop had an offer made to him by the National. He didn't want to sell as he'd lived in the area for many years and liked the neighborhood. The National came back and made him a second offer. He said to them "Will you guys quit bugging me? I told you, I aint selling. You can buy it off my kids when I die." About 3 months later I saw him again and he told me he'd moved. I said to him "I thought you didn't want to sell." He replied, " I didn't, but I'd have been stupid to refuse that offer."
Financial pressure won't work with the National. In my opinion, the weak link is prominent but probably politically liberal golfers like Woods, who could start making noise when the sound of Burk's fascist jackboots gets louder.