No, the problem with Cata and MoP is they had no normal dungeons to do as an alternative. WoD will have normal dungeons at level 100.
Most people presume you do normal dungeons to get loot to gear up for LFR and you do Heroics to gear up for Normal Raids. Blizzard stated before that the mistake with Cata was there wasn't any alternative, you HAD to do heroics and they were way too hard for LFD.
Now a player looking only to do LFR can just que up for normal dungeons and gear that way. The rest that are looking for challenge and an easier way to gear up to do normal raids can do heroics.