Will,
Maybe too much going into the v/stab failure, at this time...other issues should precede the structural failure, like on other commercial (transport category) airplanes.
Further, any statements on the "weak point", pre-designed failure location on the structure etc are moot simply because this is not the design process. Sadly, accidents will show you what really is the "weakest point".
For that matter, failure during the certification related ground tests for the structure is not expected/required.
So, for the structure, in order to fail you need a catastrophic event.
Cheers