Like two-shot vaccine protocols, "Boosters" are hardly unusual in the world of vaccines. I think the recommended period for Tetanus is 5 years. That said ...
I suspect this was part of a process begun a week or two ago. Pfizer (and others) have been testing variant-updated boosters/versions for several months. Pfizer requested an update to their EUA to include the recommendation of a third, booster, shot. The FDA replied that the existing vaccine protocol seems adequate and that there did not seem to be sufficient need to justify such a situation. My guess is that if the info in the OP article isn't from Pfizer's initial request, the info is Pfizer's response.
Contrary to the inflammatory OP article title, the whole process is actually quite ordinary. And if the FDA ultimately declines Pfizer's request, the same would be likely to happen if Moderna requests a similar update.
J&J's effectiveness in its Phase 3 test having been lower and J&J having begun testing a 2-dose regimen, hypothetically J&J could request and get an update to a 2-dose protocol. In the context of the US' vaccination process, J&J is less than 5% of US vaccinations. Such a request might be declined simply because J&J is not a significant player, as well as their original single-dose effectiveness being sufficient.
Several potential upcoming events in Covid vaccines I think more significant:
* Moderna has applied to have their EUA updated to allow youths age 12-17 to receive their vaccine;
* Pfizer and Moderna have both both begun the process that would lead to both receiving a Biologics License; in plain English, full FDA approval;
* Novavax will soon be applying for Emergency Use Authorization for their vaccine;
[Snark] Anti-vaxxers will then have a third different vaccine technology to lie about.
[/Snark] 
