This is a very good move. The argument is pretty clear -- you could end up with a destabilization of the entire judiciary as successive Administrations keep increasing the number of justice to obtain a majority.
Of course, I don't think most Democrats will find it persuasive because they believe they are likely to get obtain and keep power over the political branches, so they don't have to worry about the GOP doing this to them in the future anyway.
@Maj. Bill Martin I agree with your first paragraph, this would be a terrible time...with so many people so divided from their fellow American...for either tribe to pack the court, but if the rats won't pass it, why does this bill matter at all?
The GOP can't pass it on their own.
Perhaps it would matter if Rubio won the Presidency, and he could point to it as a signature issue, but look at Trump. His #1 issue was building a southern Wall. He had GOP majorities in the Congress for 2 years but it didn't really become important until it couldn't happen after the 2018 elections.
Same thing for repealing Obamacare.
Same thing for obscene Federal Spending.
Same thing for draining the swamp.
IMO almost nothing has been done for the last 8 years of GOP Congressional majorities, and 2 years of a Trump Presidency. Actual accomplishments are undone with the next party takeover.
How long is "at least it's the GOP raping me" enough to keep you voting?