NIN, SMN, BRD were all meta in the speedrun community in SB just check the speed logs. BRD, MCH and NIN were meta in HW. MCH was temporarily meta in SB when its hypercharged was 6% and casters didn't have their buffs yet, however, no one wanted to play it. But they were never shunned. The only job that hasn't been meta in your list is SAM. I agree however that these jobs have been shunned this expansion; NIN is in a good spot right now DPS wise and is fairly balanced against the rest of the melee. Ranged and Casters are the only jobs having real issues, but that's solely because BLM has no competitor and taking anything other than BLM for the caster/ranged spot is over 1.1k dps gone.
The ranged and casters need to be brought up to the melee levels or around there at least.