I believe that pushing a Supreme Court nominee through the confirmation process before the election will turn a dumpster fire election into something much worse.
Turn the temperature down, put aside conventional political wisdom, and let voters decide. Take the high road. If President Trump wins and Republicans hold the Senate, then here comes that 6-3 majority. If he doesn’t win, then we’re looking at, for the most part, status quo.
Now, had Senate Republicans not waited and confirmed Merrick Garland in 2016, my opinion would be much different. Regardless of how McConnell spins confirming a nominee now, it will look like hypocrisy. It could also cost them the election.
The worst scenario should President Trump and Senate Republicans push through a nominee and then lose in 2020, then I think court-packing becomes inevitable.