It shouldn't affect corpus linguistics but the other way around, because all these things have long ago (even before computers) been legally contested by author

It shouldn't affect corpus linguistics but the other way around, because all these things have long ago (even before computers) been legally contested by authors and publishers w.r.t. what can be done to text by dictionary makers and corpora managers without the authors' permission, so unless new laws get passed, the current precedents establishing what's permissible for corpus linguistics would still be valid and also be relevant for treatment of machine learning models. In essence, the long established principles for text analysis is that facts about text (concordances, collocation statistics, n-gram counts) are neither copyrightable nor derived work, and thus can be calculated, gathered, used and distributed even if copyright holders of the source data object. Now a court might judge that training a large language model is substantially different or that it's effectively the same, but such a decision wouldn't affect corpus linguistics and how they use sample sentences, only whether LLMs get the same treatment or not.