Biden win or not, McConnell and the Republicans got what they wanted with the conservative majority in the SCOTUS. That's been McConnell's life long mission and goal for over 30 years, Trump (and shady tricks) was just the opportune vessel he used to do that. McConnell's already said this is worth taking a short-term hit to the Senate, House, and even Presidency for the GOP, as it has much more long-term implications.
If the DNC does somehow gain a majority in the Senate and the Presidency, they need to get that 'court-packing' shTt together real quick to somehow mitigate this.