Do you know why the great, world dominating Empire of Rome collapsed?

It failed to change, adapt and move with the times.

Archealogical finds from the beginning of the Roman Empire show great technological advances from bridge building to ballistics, communications to city planning.

Finds from the end of the Roman Empire show that they were using the same equipment as at the beginning, despite there being radical differences in lifestyle and behaviour.

It's all very well saying "if it isn't broken, don't fix it" but the same is also true: Just because something isn't broken, doesn't mean it should never eveolve.