It is forecast that companies will get smaller not bigger.  If you look at the number of people who work for IBM vs say Facebook.  Many areas of business can work with less.

For example, in my company we have no IT department, all of our systems are in the Cloud.  We are a Social business using social media, internally and externally which means we don't have a Marketing department.  We spend no money on cold calling, cold email, advertising, as all our business goes through social.  This reduces the number of people required in sales and marketing.

The risk?  The key to this is that companies take an outside-in approach, rather than an inside-out approach.