In the case of Expedia, Bitcoin purchases have dropped by as much as 40% in recent months.
That's to be expected, isn't it?
Bitcoin priced dropped so much compared to late year. Customers who has bitcoin are likely to have purchased them at a much higher rate than the market price. They will be at a loss spending their bitcoin. It is "cheaper" for them to pay by credit card. Merchants who accept bitcoin can only expect bitcoin transactions to pick up after we see a surge in price.
I could comfortably say that they prefer fiat over bitcoin. Accepting bitcoin is a PR gimmick for them.