From an article on RealClear Wire via ZeroHedge:

"Meanwhile, the United States—still NATO’s military backbone—faces a fiscal cliff, a recruitment crisis, and an overstretched force posture. The era of limitless resources is over. American global primacy has ended. Multipolarity has arrived. The U.S. must now prioritize. And that means making hard choices about where its forces are truly needed—and where others must finally step up or face the consequences."

I don't know or necessarily agree that American global primacy has ended; weakened though ... and it's not that "multipolarity" has arrived, but that multipolarity has returned. Multipolarity had existed - was NATO's purpose - throughout most of NATO's existence. That multipolarity - and the need for NATO ... at least US involvement ... first ended with the collapse of the Soviet Union. Too many - most of the world - has lived off US largess (and American neocon dreams and wishes) since 1990.

35 years - an entire generation - is enough. The world has drained us dry - we let them for pie in the sky imaginations of global unity under a US flag - but it's now past time to end the charade. Europe in particular does not need - nor any longer deserve - American "protection".

Update April 16:
A prominent Turkish defense official has given a rare interview to a regional Middle East outlet wherein he describes NATO as a "zombie alliance" which has outlived its functionality and legitimacy as a real military alliance, something which is becoming increasingly evident at Trump threatens to walk the United States away from being its main funder and leader.

NATO is now a zombie alliance. It exists more as a myth than a functional military bloc. Its expansion has been reckless. Its operations – from the Balkans to Libya to Ukraine – have destabilized entire regions, and its credibility is collapsing.

The EU, meanwhile, is pushing a €800 billion (approximately $864 billion) military revamp under the name “ReArm Europe.” But this requires massive austerity at home. European governments are preparing their populations for war, not peace. They need enemies to justify the spending.

He then admits, "But without US leadership, NATO cannot survive as a coherent structure. Trump’s America will not fight for Estonia or send troops to Moldova. Europe will have to defend itself – and it is not ready."