My opinion on this and a raid roulette at all (some might know my formers posts ) is that its is something needed. I remember the times when you barely could get a Ifrit or Garuda HM win on DF and Titan was like... forget it. The first two of em sorted Titan was still FORGET IT!!! Then roulettes got added.... first few weeks Titan HM was 30 min wipefeast then abandon or if lucky people sorted it and won.
With a decent reward you get veterans on fights to redo them that usually wouldnt do so and this would help the newer people to progress and actually get the chance of a win. I dont expect it to be a 0->100% thing, because it wont- Even now with i120 you find wipeparties for Titan HM but it'll progress and slowly help new players. And then one day we all will laugh bout the day we all feared Titan EX in DF