Coming from someone who's RDMs have been the Tank, DPS and Healers of many of my FFI runs, and one of my all-time favourite FF job, I am pretty okay with it being a DPS this time around.

Technically, tanks should be more tanky than RDMs.
And healers like WHM should be better healers than RDMs.

So RDM falling down to doing damage as their main role makes sense to me -- Now, if they can actually do some of the other things, like healing decently even as a DPS, or have some sort of buff/debuff or tankiness aspects? Then I'll be happy they respected the Jack-Of-All-Trades part of the job.

I'll just be sad if ALL they do is DPS.