IF they reject him (as I expect), the NEXT picks will only be further RIGHT.
Rejecting Kavanaugh risks the next nominee facing a Dem majority in the Senate, or a slimmer GOP majority. If that happens, Trump could nominate conservatives until he leaves office and not get anyone approved.
There are currently 51 GOP, 47 Dem, 2 Ind (caucus with Dem).
At least 3 Dem senators are runnning for reelection in states that Trump won by 20 to 40 points. The liklihood is that Kavanaugh gets narrow Senate approval.
If post-election the GOP retains 50 or more Senate seats (likely), then the next nominee for an opening could well be Barrett, Hardiman, Kethledge, or Thapar.
It is very possible Trump gets to name a successor for Ginsburg or Sotomayor, and possibly Thomas at 70+ could resign to ensure a young, conservative replacement.
At least 3 Dem senators are runnning for reelection in states that Trump won by 20 to 40 points. The liklihood is that Kavanaugh gets narrow Senate approval.
I think there are 9 or 10 total in states Trump won.