the FCS will comandeer the elevator to do the THS job, i.e. flight path stability and thus reduce residual elevator available to the pilot or auto-pilot for maneuvering.
- perfect! So, 2 things will happen
1) The crew will know they have reached a practical, 'sensible' limit
2) 447 would have eventually run out of nose up elevator and the nose would have dropped.
Bingo!