I like that. A statute of limitations should of applied to Michael's "za zam, I just remembered she didn't want to live like this," 7 or 8 years after the 'accident' alone.
If Terri's case were handled by an honest judge, none of this would be an issue because Michael has shown himself to be a liar in enough ways that his words are not credible.
Given that Terri's case is being handled by a judge who will pretend the facts are whatever he needs them to be, regardless of evidence, I don't think such a statute of limitations would have any impact. Michael could claim Terri recovered briefly two weeks ago and said she wanted to die, and Greer would believe her.