Boo's right. Wasps don't reuse nests, and if you can wait for a bit longer until they're all dead, you can safely remove the nest yourself, as it falls apart easily. This'll save you money as well.
All wasps die in winter except the queen who hibernates, if it`s a mild winter she survives if not she`s a gonner.
Cold winter make for fewer wasps next summer.
Don`t forget that wasps are most dangerous in sept/oct when they are drunk. They feed on rotting apples and other fruit which is fermenting.
I once thought I had quite an affinity with wasps letting them walk over my hand until I accidently stood on one with bare feet, my opinion changed.
Rodz