Are they ready?

The answer is... they're working on it


Actually, yesterday Yoshi P put out a statement about just this.
He talked about what's causing the log in problem, giving some under the hood insight on the technical side of the problem, and what they're trying to do about it all.
If you wanna read what he said:

https://na.finalfantasyxiv.com/lodes...0acb6c23ccd07f