Just read this report about Amazon.com and an analysis of their customers over the holiday shopping season: http://www.mobilecommercedaily.com/amazon-meets-with-success-and-challenges-this-holiday-season
What it drove home for me was that, of all the shoppers that bought products from them, more than 50% shopped via a mobile device or tablet! That is an incredibly high number! It proves that mobile shoppers and web browsers are now THE MAJORITY, not the minority, and it is only going to increase from here.
If you are skeptical of where mobile is going, this should put that thought to rest… What can you for your business? Make sure you look good and are accessible to mobile devices.