I think this is the wrong way to look at Vine's impact.
If you search Youtube for monthly Vine compilations (ie Oct 2016 Vines) these videos have millions of views - enough to make some of these Vine stars into minor celebrities (look up King Bach).
Vine pretty much started the short form video craze.
Twitter missed the opportunity to make it so people visited the Vine app to view these compilations, which would have maybe encouraged the creators to only make content for Vine.
They dropped the ball, and now the top creators all use their competitors.