I like the idea of a anniversary/collector's edition of something. Maybe a hardcover AP a la RotRL (maybe Curse of the Crimson Throne, which seems to be much loved, though I haven't played it).
I'm personally not that big on a repackaging/rebundling of rulesets (though I know my own tastes don't necessarily reflect the market), as the more introduction points there are, the more difficult it becomes for people to unravel how to get into the hobby, particularly when it comes from transitioning from the introductory products to the core rules (I'm not sure how many posts I've seen on here asking what to do after the Beginner Box, for example).
I'm sure the Paizo marketing people are watching quite closely, and I have absolutely no reason to doubt their strategy based on their track record to this point. I do think that overreacting to a presence that hasn't even (re)entered the market yet is not the way to go, and the best path for them is sticking to and reinforcing the unique competencies and innovative business model that they bring to the table.