Vi vet inte. Tolkien själv vaklade på den.
I Oavslutade Tales säger Tolkien:
[of] the Blue little was known in the west [of Middle-earth], and they had no names save Ithryn Luin 'the Blue Wizards'; for they traveled to the east with Curun'r, but they never returned; and whether they remaine in the East, pursuing there the purposes for which they sent; or perished; or as some hold were ensnared by Sauron and became his servants it is not now known. But none of these chances were impossible to be."
Christopher Tolkien nämner i Oavslutade Tales ett annat tillägg av sin far:
Indeed, of all the Istari, only one remained faithful, and he was the last-comer [Gandalf].
Senare, i Brev , säger Tolkien:
I really do not know anything clearly about the other two - since they do not concern the history of the N.W. I think that they went as emissaries to distant regions, East and South, far out of Numenorean range: missionaries to 'enemy-occupied' lands, as it were. What success they had I do not know; but I fear that they failed, as Saruman did, though doubtless in different ways; and I suspect they were founders or beginners of secret cults and 'magic' traditions that outlasted the fall of Sauron.
Vi har också, från Folk i Mellanöstern ,
“The ‘other two’ came much earlier, at the same time probably as Glorfindel, when matters became very dangerous in the Second Age. Glorfindel was sent to aid Elrond and was (though not yet said) pre-eminent in the war in Eriador. But the other two Istari were sent for a different purpose. Morinehtar and Romestamo - Darkness-slayer and East-helper. Their task was to circumvent Sauron: to bring help to the few tribes of Men that had rebelled from Melkor-worship, to stir-up rebellion … and after his first fall to search out his hiding (in which they failed) and to cause dissension and disarray among the dark East … They must have had very great influence on the history of the Second Age and Third Age in weakening and disarraying the forces of the East … who would both in the Second and Third Age otherwise have … outnumbered the West.”
Så, vi har tre möjligheter:
Men, per Tolkien, vet vi inte vilka av dessa möjligheter, eller kombinationer av möjligheter som faktiskt uppstod för ett faktum. Vi vet inte exakt vad deras uppgift var, men om din punkt om Aragorn och Rhun verkar det tydligt vid Ringkrigstidpunkten, många tusen år efter att de blåa trollkarlarna anlände, hade de inte övertygat alla folk om Öst att överge Sauron - och det är förmodligen mycket att förvänta sig. De kunde lätt ha hållit Saurons östliga allierade i kontroll eller kaos i hundratals eller tusentals år, och vi visste bara inte.