I don't think that's what he was explaining. To me, this reads as Jack saying essentially, "I like the 140-character limit, but sometimes you just need more text, and the current solution of having to tweet images like this is stupid, so we're looking into how to do it better without compromising the common case. I don't know exactly what we'll do yet, but we know there's value in short text and there's also value to long text."