Keep in mind that dismastings have torn holes in IMOCA and Class 40 cabin tops as well, and they're designed for some pretty extensive 'deliveries' without a very large crew...To me, the salient issues are what happened immediately AFTER the mast came down. Let's face it, masts go over the side, I've been onboard for one dismasting, and witnessed another one from a close enough vantage point that we thought we might get hit by the Windex.
I have no doubt the GB guys are looking at this - my concerns would be:
1) The butt of the mast coming loose
2) The broken glass
3) The fact that impact on the giant pilothouse somehow compromised one of the hatches
4) Engine access
5) The simple fact that clearing a mast, boom and sails/rigging from an ultrawide platform like a multi hull is a completely different kettle of fish from just dumping the thing over the side on a lead slug - look at the picture of the 66 in the transpac, and imagine if the wind was 40 plus with rough seas instead of 16 kts and smooth.
The first 4 items can easily be addressed by GB, but the 5th might require some clever design work - perhaps a raised mastbase like the one on Rocket Science: