Maybe not, but remember it will mostly be the ISP taking the brand damage. "Hi tech support: The router you sent me isn't working properly! My iPhone won't connect to it, but the iPhone worked fine with the old router!"
Every pundit on the planet would make hay of the matter and everybody and their dog would know to not purchased Apple products since it breaks their Wi-Fi.
All Apple would get out of this is a huge black eye and no upside.