Uh, just because people don't constantly bring it up now doesn't mean they're not aware of it - it's happened, they know it fell, and yes, it affected everyone, but the more important thing is they survived and continue to live, which is more important. The annual Rising event is all about this - celebrating Eorzea (and by extension, Hydaelyn's) survival and rebirth after Dalamud's fall (and meta wise, FFXIV's ressurection after the disaster that was 1.0).

And it's not like Eorzea can ignore it anyway - there are literal pieces of Dalamud scattered all around Eorzea after all (*cough* Binding Coil of Bahamut *cough cough*).