A perhaps less conventional intervention could be using starlink or similar to permit remote takeover of flights that appear to be going rogue. Potentially also addresses some hijacking scenarios (though maybe introduces others).
The only thing where I could see a remote landing system make sense is during the (very few) cases of crew incapacitation (e.g. Helios 522), but it would almost certainly be done in a way that makes it very apparent and easy to override for the crew actually on board, just like the cockpit door lock operates currently: Require authentication (a PIN code) for unlocking from the cabin-side; give the cockpit crew complete authority to override even that.
That very system has unfortunately contributed to at least one tragedy (Germanwings 9525), but I think the general risk assessment of "bad guy in the cockpit" being significantly less likely than "bad guy trying to compromise the good guys in the cockpit" still makes sense.
I feel like there's at least scope for an interesting discussion on what a takeover could look like and how the process could be abused and/or protected from abuse.
For example, what if it was something that could be requested using a "call for help" mechanism available elsewhere on the craft? Perhaps there could be buttons on opposite sides of the galley that would activate the distress call, so two flight attendants would have to collude for it— that would call the attention of the ground station to a pilot-incident-in-progress who could then receive telemetry and begin to investigate what was going on and go through some kind of clearance process to unlock the final takeover key that would let them disable the cockpit if deemed necessary.