$5 is a hardly possible scenario in the observable future taking into consideration current global cryptomarket conditions, XRP circulating supply and its current MC. It is possibly only if the cryptomarket MC approaches to or exceeds $1 trillion, then all assets incl XRP will experience huge speculative price spikes.
But, XRP aims to be the officially recognized asset massively used by banks that means a necessity to evade a price volatility and to be less speculative asset. If XRP will be widely used by leading banks it is possible that XRP will leave the cryptomarket to opearate in legally stable and friendly regulated environment.