I'm really curious as to how it will go. We know what the historic probability is, but this time around, I'm not sure it will hold. I see it as a couple of generalized scenarios:
Kavanaugh's confirmation satisfies the right, so they slack off, because voting is still a month away. It fires up the left, and they stay hot through election time. Had Kavanaugh not been confirmed, it would have been the opposite.
Or:
As I presumed elsewhere, this has all been about more than Kavanaugh (at least for the right and even the center, and even some moderate dems). This has been about a very ugly attack - including by senators who took an oath - on our system of justice that is enshrined in "innocent until proven guilty". Kavanaugh's situation has, I think, scared a lot of people because he represents not a Supreme Court appointee, but a citizen getting the mob shaft and the Kafka treatment.
If the latter holds true, and the left continues their nutiness about attacking politicians in elevators, restaurants, following them home, etc., and if their celebrity useful idiots continue to attack the country, I think the right through center remains fired up for the next month and that "blue wave" doesn't happen. I don't expect a big "red wave", but I expect a status quo or even a couple of seats gained.