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RE: How does increasing the temperature affect the rate of reaction?
You are correct, though if the polymerase we're to remain folded, as with other reactions it's rate of catalysis would speed up.
In the polymerase chain reaction use for amplifying DNA in molecular biology, special thermostable DNA polymerases are used, from organisms that thrive in extremely high temperatures, these polymerases do not unfold as easily, some having stability up to 100 C.
As I read your response, I can't help but think about what temperatures biological proteins can survive? In particular, could a "hitchhiker" survive the hot temperature of a meteorite entering our atmosphere? I am sure this question has been tested somewhere/sometime.