Very interesting comments by Musk regarding just that:
https://www.youtube.com/watch?v=J0ycYCtjWtE
0:32 in vid. The engr. who made that call may be sweating a bit...
Yes. Thanks for the vid link. Musk said it was 50 percent chance of blowing up, and was sweating bullets that it would clear the pad. My understanding is that Texas is a test site during development, and that the pad in Florida is and will be more robust with trenches, flame diverters, etc. The test site in Texas is a facility that can be repaired and upgraded repeatedly during test flights. But the government environmentalists impose limits on what can be implemented on the launch pad due to the water table and beach nearby. SpaceX ended up polluting the area anyway, what with chunks of concrete and sand hitting the beach and gulf waters. NASA has some worrying to do about the SpaceX launch pad in Florida being so close to other pads (ULA at 41, and others nearby) - if an explosion were to happen on the pad.