Either price increase or cancellations of lower selling books, regardless of critical buzz. I have a feeling they will try some of the latter before raising prices. What they should do is stop with so many variant covers and the 3 or 4 mini-series that seem to start up every week.
I hate to say it, but I really think that the variant covers help the sales. The truth might be that while everyone complains about them online, retailers order more copies of books in order to nab an incentive that they know they will sell at a premium within the first few months of a release.
The truth is that whether you like them or not, incentive covers are helping raise the bar on orders into Diamond where the orders count.