If the RINO McConnell dies Democrat Governor Andy Bashir has two options 1. appoint a Republican to the seat or 2. call a special election. He cannot appoint a Democrat.
This goes back to changes in Kentucky law in 2021 and it says the Governor must appoint a candidate from a list provided by the Senator's party.
A 22024 law provided for a special election to be called and run with weeks, so that is probably the route Bashir will take if the old boy bites the dust. Given how well the Democrats have done in special elections around the country since the last election there is a real danger they could win McConnell's Senate seat. This won't be enough to flip the Senate but it will make moving anything more difficult and clowns like Thom Tillis will be empowered. Also, an incumbent Democrat would be much harder to beat in the mid-terms than a challenger.
Right now we need McConnell to stay alive, even if he isn't voting, until the mid-terms. He was going to retire anyway.