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there is the possibility the Supreme Court would rule it unconstitutional

It's important to note that they'd still have a cloture vote, but the threshold would be reduced to 50 instead of 60. This is to get around some lazy wording in the Senate's construction.
If SCOTUS rules that unconstitutional, I'm not sure on what grounds they could possibly do that. 3 of them are on the court with the same rule (50 vote cloture) in place for their confirmations. Such an absurd ruling would actually merit the expansion of the court justified.
Other than Robert not likely. Republicans learned a lesson with Souter and they not work hard to make sure the candidates are Federalist Society Approved. Democrats are likely going to apply strong tests to get close to the same results. >


Democrats are likely going to apply strong tests to get close to the same results.

I mean, they've had that for decades now. How often is it a member of the liberal wing that joins the conservative wing on any decision? The closest one I can think of was Kagan joining in Masterpiece Cake case and that wasn't even on the merits.
I'm ideological uniformity and lockstep voting is the hallmark of liberal Justices. The Democrats work has already been achieved. >

You don't even know what Citizen's United was about do you? You didn't even get the voting right. >

Switches as in consistently votes with the liberals on consequential decisions? Very little to no chance. A conservative appointee may not be totally in line with everything the GOP wants but usually by the time they get to that level they have a well documented history and legal theory which is quite different than the people Democratic presidents would nominate. They may be quite “independent” but not full fledged liberal.
If Dems want to get to a place where there is more equal ideological shift (or even a liberal majority) they need to either wait until conservative judges leave office or alternatively expand the court. Expanding the court would require abolishing the filibuster and there is the possibility the Supreme Court would rule it unconstitutional. If that happens it would trigger a potential crisis.