Criterion dungeons are going to exacerbate a lot of the problems we have now and if they're tuned to be even somewhat similar to savage raids, there's going to be some major issues. Double melee is probably going to be very popular if dungeon mechanics don't force strict spreads since role bonus isn't as important and it's going to be hard to justify the significant gap between BLM and RDM/SMN who get doubly penalized for being support dps and having non-functional raises.