When will the current market bubble in stocks and bonds end?

David Stockman, former budget director in the Ronald Reagan administration wrote an article in the New York Times on Easter Sunday entitled "Sundown in America" where he has given a brief history of the various market bubbles since the 1970s when the big Wall Street banks essentially turned the US economy into a giant casino driving booms and busts. He ends the article on a very ominous note reproduced here "there are trillions of dollars of assets, from Shanghai skyscrapers to Fortune 1000 stocks to the latest housing market “recovery,” artificially propped up by the Fed’s interest-rate repression. The United States is broke — fiscally, morally, intellectually — and the Fed has incited a global currency war (Japan just signed up, the Brazilians and Chinese are angry, and the German-dominated euro zone is crumbling) that will soon overwhelm it. When the latest bubble pops, there will be nothing to stop the collapse. If this sounds like advice to get out of the markets and hide out in cash, it is."
This view has been challenged by the pollyannish talking heads at Bloomberg citing assorted University professors challenging Stockman's view (see video). I personally am inclined to agree with Stockman about the bubble - it will be rather curious to see when this on will burst.