[troad]

It is wrong, in the sense that native speakers do not say that, and it triggers what linguists call a "grammaticality judgment" in a native speaker. Same as "He eat apple" or "I am go to school". These may be comprehensible utterances, but they do not fit into a native speaker's internal grammar of valid English sentence structures.

Yes, languages can change, but there is no evidence that native speakers have started saying "a French". The only context I've ever seen that in is "As a French...", which strongly implies a non-native speaker of English. The evidence suggests that it's a common language interference error from French, not some future development of English.