What the EU does for travel within the EU may be interesting, but probably will not apply to non-EU countries....like the US.
What the US does may be interesting, but probably will not apply to travel within the EU.
At the moment the biggest problems for US flights to Bonaire are (a) the Netherlands policies being applied to Bonaire, (b) the every-increasing surge within Bonaire itself, and (c) the reluctance of US airlines/health-care companies to provide the early-in-the-morning testing required by the NL...an expensive proposition to set up to travel to just one country, a requirement which may go away if the airlines just sit on their hands for a while.
This is aside from the growing concern about "equity," i.e., what about those who have not yet been able to get vaccinated, or can't be vaccinated (allergies, religion, etc), or don't want to be vaccinated (although I have no sympathy for this latter group)?