$500 is not that much for bitcoin to rise, bitcoin only needs a little pump for this to happen. I'm sure bitcoin will be able to reach this within 2 months, bitcoin is only $100 or so away from it.
Pump???
People need lot of bucks for that to happen, as many are selling above $400 and for $500 to be reached, there are many sell walls that need to be broken...
No one would show you a magic show here without any reason, even Chinese pump BTC because they get bored and want some action in this stable environment...