Five years after Lehman, is another crisis possible?

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This coming Sunday, September 15, will mark the fifth anniversary of the historic collapse of U.S. investment bank Lehman Brothers.

That watershed moment in the global financial crisis triggered a series of government bailouts for lenders in the West and led to the worst recession since the Great Depression.

Demands for structural reforms, smaller banker bonuses and deeper capital cushions have been met by several institutions but some critics still believe that the banking sector's "Too Big to Fail" problem remains a troubling reality that could unleash another market shock.

(Read more: Was Lehman failure really 'best and only outcome?')

What do you think? Five years after Lehman, is another global financial crisis still possible or have we learned from our mistakes? Vote in our poll and tell us what you think.