Wordpress is only 20 years old, and whilst it’s currently a viable company there’s no guarantee that they will be so in another 20 years.
As for 100 years? Sorry, not buying it (both figuratively and literally): we’ve already seen a huge change in technology that has already deprecated many a tech stack, and that change is only increasing in velocity.
$38K is a huge sum to put down when there’s zero actual proof they’ll even be able to sustain this for 25 years, let alone 100.