In a Nutshell: Following a large number of new studies from the 1980s to 2000s, along with the re-examination of Ottoman history using previously unused sources and methodologies, historians have reached a consensus that the notion of long term Ottoman decline was a myth. The Ottoman Empire did not stagnate or decline, but rather continued to be a vigorous and dynamic state for most of its existence.
The decline thesis has been criticized as teleological, regressive, Orientalist, simplistic, and one-dimensional and described as a concept which has no place in historical analysis.
Over the last twenty years or so, historians of the Ottoman Empire have rejected the narrative of decline in favor of one of crisis and adaptation. Rather than speaking of Ottoman decline, it would be more accurate to say that what had occurred was an adjustment of Ottoman methods of rule and the balance of power within the empire to changing circumstances.