Unless the contract says otherwise, yep. But I doubt they'll be able to keep on charging current licensees (like Apple for example)...

I'm surprised that companies like Apple, with sizeable legal departments, didn't bother to do the research necessary to get the patent thrown out. Sure, I can see that they might pay royalties in the short term for the sake of expediency, but I wonder why they didn't also investigate getting the patent re-examined themselves...

I have a feeling that it would be a very bad idea for Apple to piss off Amazon in that way.