I notice this thread was just last year 2015 and yes, for now the price of $500 was already reached and even surpassed. That concludes that this thread is giving us a conservative projection, and normally when we are not too confident to see it, it normally happens. So in overall, I think the question would be after the $500 will it reach to $1,000?
I don't think that price will fall to $500, price is recovering now sow we can expect higher price in coming months and maximum it can achieve in this year is $800 not more then that.