It would probably be too risky to limit pilots control authority during landing. What would protect perfectly on a calm sunny day, may cause severe problems on a stormy and gusty day.
If you want to prevent a certain pitch exceedence, you have to also involve autothrust to compensate for the limited Cl due to limited AoA. So you may prevent tailstrike, but provoke a runway overrun... If thrust can be increased as quickly as AoA at all if required. Maybe in combination with something like the DLC on the L1011 you may be able to limit pitch effectively and safe.
A tail skid however would have been a clever idea. Others have that.