My guess is...
Once 3.1 comes out, they'll have new Ex Roulette dungeons. With 2.x, the previous Ex Roulette dungeons got added to the new High Level Roulette.
Since High Level Roulette requires completion of all dungeons in it before opening the roulette up, the level 60 dungeons can't be added to the old High Level Roulette, since it'd lock out all the non-HW (and non-60) people from doing it.
Most likely, they'll make a new level 60 "high level roulette", and chances are they'll stick ARF into that as well as Neverbleep and Fractal.

Originally Posted by
Eidolon
solved the initial problem of "Wtf only two Expert dungouns dear god this is so tedious why is this so aweful to cap eso weekly" by giving us a third dungoun.
Well, yes. Instead you'd have the problem of "Wtf, why doesn't ARF reward i160 gear? The other two dungeons do, why doesn't this one? D:"
As for myself... I complained like heck about the lack of loot when I ran it the first time... then quickly started accusing all those imperials of STEALING IT! D: