The period from 2015 to 2030 would have been the best historical window for the Argentines to attempt to retake the Falklands; however, they managed to outdo themselves by effectively dismantling their own navy.
Beyond 2030, such an endeavor becomes impossible, as the British are pouring billions of pounds into rearming the Royal Navy—ensuring that, in the medium to long term, their position will be significantly stronger than it is today.
Regarding an Argentine attempt to seize the islands:
They cannot—or, more accurately, they lack the capability to do so.
The Argentines possess virtually no amphibious landing capacity. Barring an airborne operation—using paratroopers—their navy could, at best, land a few platoons to establish a beachhead. That is, assuming they could even reach the islands, given that their escort vessels are obsolete and limited, particularly when faced with threats like anti-ship missiles and drones.
Furthermore, the islands are now defended by a much larger force than the single platoon present in 1982. The Argentines would suffer heavy casualties, and, in theory, the British would have sufficient time to bring in reinforcements—reinforcements that would face little threat, given the degraded state of the Argentine Air Force (which has only recently shown marginal improvement with the acquisition of a few F-16s).
Even a single Astute submarine—armed with roughly 24 torpedoes and 12 cruise missiles—would pose a formidable obstacle; should the need arise, a second vessel could be deployed.
Moreover, unlike in 1982—when the Argentines at least possessed submarines (though they were never effectively utilized)—they have had none for years, and will have none until at least 2030. It may well be another decade before their submarine capability is restored.
