A problem with 455 is that it's a mere 63% off the top, and it was no particularly high volume either. But, purely from the changed look of the chart because of the uptrend from 455, it looks unlike 2011. While that doesn't necessarily mean it can't play out similarly or even worse regardless, I think there's at least as good an argument to be made for a larger triangle/sideways move that will take months to conclude, and thus, a bottom higher than 455.
In any case, Bitcoin has fundamentally become a dangerous game because miners have had such large marginal profits for an unprecedented amount of time. Here's the chart I watch for that. Just ignore the pre-ASIC period and the y axis labelings, the only thing that matters is the relative trend here. New lows in margin profits mean higher and higher pressure on miners, and eventually, they will have to sell nearly all of the daily supply, of which I suspect, unlike any real world mining market, a large part has been withheld from the market until now.
We are speculators. If we even get a whiff of this, we bail and force them to sell an even larger percentage because of the decreased price. It's a positive feedback loop of nightmarish proportion, and it is what happened in 2011. The difficulty even began to decrease because it became unprofitable – something I don't expect to happen with ASICs because they can only do SHA256, but I do expect the difficulty growth to decrease extremely, and that could be a hint for investors.