The Fla Supreme Court was SO out of control, I think they would have ordered Harris to certify a Gore slate, and the Legislature would surely have appointed a Bush slate.
The Joint Session in January 2001 would have received two sets of Florida EVs, and would have had to chhose-which they would have done, in Bush's favor.
The USSC taking up a political question was a big mistake, IMO.
According to Foley's office, they believed that they had the ability to solve it and the Florida Supremes would not have been able to intervene. Perhaps they were wrong. Theoretically, the USSC could have refused to hear it, the Legislature would have given the electors to Bush, the Florida Supremes could have exceeded their authority, and then what? What if the Florida Supremes ordered the electors to be given to Gore? It seems that it would then have to go to the USSC. All hell would have broken loose if the Florida Supremes ordering electors to be given to Gore, the USSC refusing to hear it, then a Republican congress overturning them in awarding the electors. I think that would have caused riots in the streets.
And the Legislature's would have been chosen. NO state supreme court has authority to have any say on the slates of electors. Only the state legislature does.