In my humble estimation every investor just wants to hold Ripple, there is a huge demand for Ripple. But as you above said if they start selling off Ripple, no doubt there will be an impact on Ripple, but not a big impact. For me Ripple is the best for holding long-term, it is really worthwhile to invest in Ripple.
Huge demand for what? The former of co founder ripple has started to sold his chunk and another big problem has come when the agreement for the lock up period of ripple foundation premined coin has already ended.
This coin has no future just more and more coins dumped anytime. it's not even the best choice for short or long term.