I feel they're going to have a lot of trouble with DNC damage output.

Especially since they wanted to reduce synergies that promoted specific job compositions.

Given that BLM and SAM exist as "Selfish DPS" that do higher pDPS than other jobs, it already suggests that DNC needs to be in a party with a BLM or SAM in order to function - If they balance their output around this (If not, then they'll be partied with a BLM or SAM to supercede their balanced output)

That is, unless the changes to other jobs rDPS boosts are significant enough to allow them to bring all jobs pDPS up to an equivalent level. So that DNC is the only one notably lower than everyone else but makes it up by buffing someone else.

However, I just can't see them doing something like that. In which case, it's likely that DNC will only be viable alongside a strong BLM/SAM player or if not, the meta will become simply playing a DNC alongside a strong BLM/SAM with the remaining 2 DPS being whatever 2 jobs would work best at facilitating said BLM/SAM or providing overall rDPS value.