[lxgr]

Locking out a conscious crew in the cockpit? Never going to happen, for reasons others have already listed.

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.