My guess is that they'll rule he doesn't qualify for being kicked off the ballot due to the 14th Amendment, but then they'll "balance" that ruling out by ruling against Trump in his "Presidents are criminally immune no matter what they do" case. As if they'd ever rule in favor of that theory with a Democrat in the White House.
If presidents are criminally immune, then Biden can be president forever. And he could order the execution of any supreme Court justice. They need to be careful in the ruling.
The right wing justices on the court owe Trump nothing, and can look forward to using their lifetime positions to continue to ruin the country for decades. He was just a useful tool for getting them onto the court. They want Trump to stop bugging them and let them get on with it.
The three Trump justices and Thomas could recuse themselves, citing some previously hidden sense of ethics (and Habba specifically asking them for a quid pro quo).
Then a majority of the remainder would then remove Trump from the ballot.
This achieves 3 things:
Republicans would be rid of Trump, because he’s a liability to their long term success. They could nominate Haley or whatever for this cycle.
Republicans could shriek (and fundraise) endlessly off of “partisan librul socialist Democrat justices” removing Trump and why they need even MORE right wing justices.
Trump’s stochastic MAGA terrorists would focus all their fury and rage on non-rightwing justices (rather than deciding that one of their own was a “RINO” and targeting them).
The only problem with their scenario (for the Republicans and those that control them) is that Trump would freak out and might tell all his followers to storm the Supreme Court anyway.