But 1492 has a number of interesting events. It's the year that Spain got unified as the first modern state, with a centralized court. That's a crucial event to get over feudalism. Coincidentally it's the same year Columbus reached the Americas, so it's an event relevant to globalization.
Erasmus, also a central figure, was ordained that year.
In 717 CE, the Eastern Empire controlled most of modern day Turkey and some scattered enclaves in Greece and Italy.
If that's not a collapse, I don't understand the meaning of the word.
For example, by 1300 you have Kings of England with substantial documentary index.
In 600 you have ongoing Anglo-Saxon settlement, the written evidence is poor, but there seem to be tens or hundreds of independent political units.
There are reasons people refer to the early middle ages specifically as the "dark ages".