Excuse me? The Rangers *disappear* after Aragorn becomes King? Whatever makes you think that?
Sauron has fallen, but just as in the case of Morgoth his creatures remain. All the Orcs in the Misty Mountains, and Trolls in the Shaws and Wargs and Dragons and what have you won't just evaporate, they will have to be hunted and fought for decades, even generations - not to mention all the deluded Darkness worshipping Men. Aragorn is going to need his Rangers's special skills more than ever now that he has the Reunited Kingdome to defend and patrol.
The Twins have been fighting alongside their Mortal kin for a long time now. It is quite possible they have come to identify more strongly with Men than Elves. They do ride with the Grey Company after all, rather than going to join their grandparents' battle against Dol Guldur, allying themselves with Men rather than Elves in the final battles.
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