It's hard to say if btc will retain it's authority. Bitcoin transactions are slower and cost more in fees than existing alts. So, it could be replaced by a new coin because of that.
It's nearly impossible to say what will happen in 5 years. On one hand, I can't see bitcoin ever being worth zero. Pennies perhaps, if regulations make it useless, but never $0. On the other hand, block rewards will half by then and I think the volatility will level out. I would guess the price hovers around $400 once that happens.
I pulled one more sentence out of my ass. I think it tops out at around $4000 each some time in 2017 and comes back down to today's level after a new alt gains authority.
__________________
<!--BEGIN SIMUTRONICS PLAY BUTTON CODE -->
<p align="center">
<a href="http://buddy.play.net/dr?TMOREAU1">
<img src="drplay.gif" width="128" height="64" alt="Play DragonRealms!"></a></p>
<!--END SIMUTRONICS PLAY BUTTON CODE -->
|