I think it’s actually a better court for challenging QI than it’s been in decades. Replacing Breyer with KBJ and Scalia with Gorsuch moved things closer. Thomas has also come into his own. Kennedy to Kavanaugh was probably a wash. RGB to ACB maybe a small step back.
What are the practical implications then if it's indeed primarily signal to noise? Just a bunch of lawyers (and their boosters) making political plays that go nowhere but burden the system? And a bunch of police who get caught in the crosshairs while union lawyers take the brunt of the impact, while police spend years on paid leave and amplify police hiring shortages?
There aren’t different courts for lawsuits against the police. It’s not just police sitting on paid leave but innocent people languishing in jail while their case drags on and actual disputes that aren’t frivolous dragging out rather than being resolved so that the parties can move on.
The English Rule makes litigation inherently higher risk for less wealthy litigants while barely limiting more wealthy ones, and further tips the balance of the legal system to the wealthy. And it doesn’t address the need for QI.
OTOH, QI would be fairly comprehensively solved if the immunity was treated as an indemnity by the employing government rather than a simple immunity, such that, should QI be established to apply, instead of the case being dismissed before reaching the merits, it became a case where any damages would be the responsibility of the employing government agency rather than the employer, bypassing any otherwise-applicable governmental immunities. (The logic of QI is that it is unjust to hold a government employee responsible in their personal capacity for a violation of the law done in their capacity as a government agent, within a zone in which they had discretion in the job, and where there was insufficient basis for them to know that the act was a violation; there is, I think, a very good argument that this is the case but that the result should not be that all remedy is lost.)
The problem is when governmental immunities stack with personal immunity under QI and with insufficient prosecution of crimes by public officials to denial all remedy, not with QI alone. In fact, I would argue that QI is, alone, the least important of the three roots of the problem, just that it prevents the last available end-run around the more important ones.