People getting paid in Bitcoin.
Using bitwage.co, starting in 2015 I will get 100% of my paycheck in bitcoins.
2014 was the year of big companies accepting bitcoin but converting those to fiat. 2015 will see more and more people choosing to get all or part of their paycheck in bitcoin.
There has always been a chicken and egg problem with Bitcoin. Merchants won't accept it because people don't spend it, people don't spend it because merchants don't accept it. People getting paid in bitcoin will push the spending part.
If by the end of 2015 there are 10-20,000 people getting paid in Bitcoin that is a huge steady stream of fiat to bitcoins, setting up 2016 to be huge with the halving.
I think a lot of people are not ready to be paid in bitcoin because of the volatility.
That is the only big drawback which demotivates people from investing into bitcoin.
Even 5-10% of your paycheck would be a good way to get started.