Gartner predicts that the market will show consistent growth through 2013 when worldwide SaaS revenue will total over $14 billion for the enterprise application markets. In other words a lot more demand will be placed upon the network to carry applications over the web and into the enterprise. Note that this is paid research.
According to this Gartner report, network administrators better get ready for a while lot more traffic. Worldwide software as a service (SaaS) revenue is forecast to reach $7.5 billion in 2009, a 17.7 percent increase from 2008 revenue of $6.4 billion.