Elessar visits in F.A. 16 and starts rebuilding Annúminas (well, he probably orders it, his armour could get mortar on it and that is not good for fine armour). We, here, also presume that a certain number of Dúnedain live in Arnor still. Whether it was ever recolonised, we do not know, but must assume yes- otherwise there would be no need for a Shiregrant to the Hobbits. You can write me at palle_r@get2net.dk and get my "musings" on the subject. Several here has, it is called Borderlands and has recieved good or no response (it is a MERP module made for myself and for fun, and continuously under construction).
NT