While anything is possible, a market crash is about number 327 on my list of worries. Way too much money on the sidelines slowly filterin in, nice rotation from bonds to stocks underway, wonderful political gridlock, and the biggest reason of all why it seems unlikely.....companies are still incredibly lean and mean and tough from what they went through in 2007/8/9/10...and only a few years have past so they actually remember. Also, no bubbles in this economy right now. Banking system solid (though too many regs), housing is solid (though likely due to low int rates), still tons of stocks with sub 1 PS and/or sub 1 PB and/or sub 10 PE.
All that said, the greatest place to be in a crash is with a company like Hutch that is poised to see rising revenue, faster rising profits, and a bright outlook on increasing market share.