As I've said many times, I don't think companies like this are going to be the ones that go ahead and move to accepting Crypto based on the fact that you're going to be using them either way if you want to buy something from their site. It's sad that they wouldn't want to innovate, but why would they spend the time and money associated with it when they don't need to in the least.
But going on the tangent of if they would accept BTC, I think it would start to stabilize the price of bitcoin based on the fact that a lot more people would be using it and it would be in demand for the price to be stable.
This option is unlikely due to the fact that bitcoin is not regulated by anyone. But if they could do this, then the crypto currency would be much more popular and its price would rise significantly.
Price would need to stabilize, people don't want to be using a currency this is worth x amount one day and 9/10th of that the next day. This is why people don't want to put their savings accounts into bitcoin too.