If somebody is disrespectful enough to engage in behavior as pathetic as that, then I want nothing to do with that person. Maybe "hipsters" would be fine with such shabby treatment, but I'm sure I'm not alone in thinking it's an extremely distasteful thing to do to somebody you're conversing with.
Assuming one would find out about such, which is plausible, but so is the opposite. I can even imagine such a system being engineered to lower such chances of the recipient being rendered unable to discern such messages from current situations where people ask friends nearby in person or over the phone.
It's amazing to watch what people/computers are able to do that can challenge the social constructs that are ingrained into us that some of us have come to accept as how things should be, only to be collectively reminded from time to time of how such systems are constructed on shifting sands in the scheme of things.
If somebody truly can't think of what to say next to me (or anybody else) in a conversation, then ending the conversation or admitting to not knowing what to say is much more sensible and preferable than spending money on getting some third-party to create a response.