They'll accept it when it's no longer volatile. Now is the wealth preservation phase of Bitcoin.
^^^ This.
There are stages to this process folks. Bitcoin is only 3 months old, as far as worldwide awareness. How long has the US Dollar been around?
How did Gold look as a currency 3 months after it was first used?
Hoarding (saving) is really just propagation of the currency, which is necessary while Merchants establish the infrastructure.
When both are done? Commerce begins.
-Burger-