Perfectly logical and predictable result.

Wouldn't surprise me if their tips (for tip jobs) went down as well.  When a customer knows that the price for their meal and drinks went up to give the employees higher pay, it's logical to think that 20% tips should no longer be the norm, and back them down to maybe 10%.

In fact, I remember reading last year that some restaurants are purposely taking that all the way at once -- jumping their employees to $15/hr and making it a "no tip" establishment.  Same exact principle.  

Now that Colorado has enacted a significantly higher minimum wage, perhaps the normal tip% should be coming down here too.  I saw a number of menu price increases after that law took effect here on January 1.