How does that solve the problem? Landlines will still continue to exist and people will still mistakenly believe they can receive texts. It seems like a doable solution to have non-mobile numbers auto return a message that it cannot receive text messages. Where do the text messages to landlines go? Into a black hole? I assume there is a service that at some point realized that the number cannot receive a text message and sends it to dev/nul. Instead, why can't that service ping back?