The complaint itself would get dismissed for failure to state a claim upon which legal relief could be granted under rule 12(b)(6) of the Federal Rules of Civil Procedure. The consultant would have to respond to the complaint after being served with it, but, given that the consultant bears no responsibility for the collapse (they said there were issues and pointed them out in detail, but the concerned parties did nothing about them), there is no grounds to sue them for damages stemming from the collapse.

Source: law student who did OK in civil procedure, but still consult an actual attorney before relying on any information contained herein.