I feel that even though the value of bitcoin has fallen and I noticed it was stagnant at $6.4k from yesterday, but that value is still the best price I think, because bitcoin can still survive and not fall deeper than $5k.
I assume bitcoin is priced at US $ 10,000. That's a rational price considering bitcoin is almost US $ 20,000 in December 2017. The price of bitcoin is not determined by the value of gold, because the cost of gold mining is relative. So, the indicator of rising or falling bitcoin prices is the amount of demand and availability of bitcoin on the market.