Just wondering why so many people are jumping the Gun right now about Classes being removed from FF14?

There are other possible outcomes and reasons such as...

Yoshi-P mentioned back in 2.0 the plan for creating Advance Jobs that may require players to first obtain 2 certain Jobs first before they can unlock these Advance Jobs.

The Example used was Red Mage being a Advance Job that required Black Mage and White Mage. (Yoshi-P stated it still remains undetermined if Red Mage will be a Advance job so don't take this as evidence Red Mage will be a Advance Job)

However, this is only something he explained that could be a possible outcome for specific Unreleased Jobs and does not promise it will happen.

As of now we know nothing about why Dark Knight require no Class to obtain but a good amount of people are jumping the gun and assuming class system will be removed without any solid statement from the development team.