If (when) usd falls.
People will look for things to invest their money in to prevent their wealth from losing value as the dollar falls.
Many will buy gold, silver, jewels. Some will buy color tv's, electronics since they're not bad at holding value.
Others will buy bitcoin. It could increase demand for crypto which in turn would case the value and price of bitcoin to increase.
That is a very good run-down of projected events. Logical, factual and by and large true.
It holds true for the Rupee as well, but in the case of the Rupee it wouldn't mean nearly as much