From Popular Mechanics:How budget woes, lagging technology, a resurgent Russia and domestic politics are dissolving the power of a legacy military alliance.
There will be a lot at stake at the end of November when world leaders gather for a pivotal NATO meeting in Lisbon. The meeting is meant to hash out a new Strategic Concept, an all-encompassing document issued every decade that guides the alliance's actions and priorities. The last Concept was drafted before 9/11, before the subsequent invasions of Iraq and Afghanistan and before Russia's resurgence as a regional power (and a worldwide power player).
NATO was smaller back then, as well, and has since adopted countries in the former Soviet Union that border Russia. It's a different world—and there is serious doubt that NATO will have the money and political fortitude to remain relevant.
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My Comment: The short answer is yes. Unsustainable government budgets coupled with no clear defined mission has resulted in Nato member states focusing on other priorities while leaving NATO out. Absence of a major terror strike or another war .... this "crumbling" of NATO will only continue.