Someone jsut cracked me up saying bitcoin will stabilize at "0" in a couple of years. 
Show him/her the following Stat and ask for his/her opinion...
A statistical explanation why 1BTC may equal 1M USD in future...
Value of 1BTC (around figure)
2009 => 10-2 USD
2010 => 10-1 USD
2011 => 100 USD
2012 => 101 USD
2013 => 102 USD
2014 => 103 USD
2015 => 104 USD
2016 => 105 USD
2017 => 106 USD
--- Early Adoption Ends Here and The Price Stabilizes ---