Well...now that FFXIV is starting to get ALOT more attention....I hate to think of the idea it might see an attack.
Cause anything/everything popular sees a server attack. ANd people love to do it at the launch of something new.

Otherwise...I think the worse that could happen is a 10 minute wait with a large que time.
Thats how it was in Stormblood and Shadowbringers. just a little wait.