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.
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.