Umbrellas...? And less content...?

[Zanarkand-Ronso]

I think the idea is that people want dungeon content to be better when they complain that they're boring, not that they want to have them start being cut from the development cycle bit by bit.

Ok, so by getting 1 less dungeon, perhaps the one dungeon could be better. As I have said.
We aren't completely losing Dungeons, just getting 1 less per Major Cycle.

Because a lot of the additional content that SQEX puts out isn't something that grabs a person's attention for more than a week (Blue Mage); or they only design it so they're internally happy with it, and then spend the rest of the expansion trying to fix the content because by in large, very few of their customers were happy with their pet project that they spent all that time on (Diadem and Eureka).

This doesn't answer my question. Its not wrong, but it doesn't answer anything.
The same could be said about Dungeons. XIV's dungeons apparently bore people, they are apparently only good for 1, 2 or 3 runs. So how does losing 1 dungeon effect XIV in a negative way?
What if it actually helps the game in a way? What if it improves other content, and other things can get worked on quicker?
Its literally, ONE dungeon.