From Jonathan Bernstein:
None of this is likely to change the eventual outcome. Four senators remain undecided — Republicans Murkowski and Susan Collins of Maine, and Democrats Joe Manchin of West Virginia and Heidi Heitkamp of North Dakota – and political incentives, not the investigation, are likely to guide their choices. Every other senator has announced they will vote along party lines in the chamber, which has 51 Republicans and 49 Democrats.
It’s worth noting that if Kavanaugh goes down there is still plenty of time for a replacement to be named and confirmed before the end of this Congress. There is no scenario in which Republicans wind up losing control over this Supreme Court seat. The open question is whether it’s Kavanaugh or some other very conservative Republican who winds up getting confirmed.
Eventually, the four undecided senators will have to choose, and it’s not impossible that a few extra days could matter.