Solution is don't spend as much.  The conservatives were at a balanced budget until the Liberals started a spending spree - which was intended to be spent on infrastructure but it appears to have gone many other directions.  
Spend less and you don't need to come up with new ways to generate revenue.  
This is so far off what they campaigned on - I can't believe they are not being taken more to task on this.  I like Justin and will vote for him if he can rein in the deficit through spending control.