The above is only true for personal dps. If you look at the raid contribution MCH or BRD brings to the party, it does not change whether a DRG is present or not (outside of small gains in multiplier stacking). When looking at what you bring to the party, it's DRG who should be worried about not having ranged in the party, because their rdps contribution goes down the drain, and in fact it's much better to replace DRG with another class if there's no ranged classes present. MCH and BRD still provide the same raid dps regardless of party setup. Of course, if you have two ranged in the party, then DRGs' rdps contribution becomes the highest in the game and that's why you take a DRG, not because it makes MCH/BRD "better."
I think it's incredibly vain and selfish to think that your dps is only worth it when there's 5 other jobs lifting you up. MCH/BRD contribution to the party doesn't go down with non-meta setups, only your personal number, which is absolutely not the thing you should be looking at. It's much better to look at how useful you're to the party than your own e-peen.
