I can't see Ragnarok being a fad unless one of the weapons/weaponskills or DRK itself sees a significant change. Such logic would dictate that Ukonvasara and to a lesser extent Verethragna are also fad weapons, yet that is clearly not the case.
I also can't see how you arrived at your conclusion regarding current weapon choice. Ragnarok displays a significant advantage over OAT, if you're going to burn time and gil on a greatsword to go along with Apoc it might as well be the one that's 20% ahead instead of 2% ahead (if that; if Apoc can spam Entropy it can actually pull ahead of OAT even without defensive considerations).
Did some testing on 99 Rag's critrate and 2.5x damage procrate on the test server. The critrate bonus is 14% and the 2.5x damage procrate appears unchanged from the bonus on the 95 weapons, which is odd since I seem to recall SE saying that they would increase the procrate.
Also as promised, Lugat's reply:
Lies, safefacing, and a general lack of evidence to substantiate claims made. Sending me parses generated after the fact isn't even worth anything, the point is that you have nothing of value NOW. Yeah, I was in a shell with Bleublood... years ago, for maybe a couple of months tops before he jumped ship to Ragnarok. Not sure how/why that would motivate a PM.