Implementing virtualization without monitoring?

We often find at T3 Dynamics that clients are rapidly moving toward more virtualization, private clouds and public clouds.   Everyone is doing virtualization with the battle in full swing between VMware and Hyper-V for servers and XenApp/XenDesktop for the desktop.   With the current burst in capacity and density of server hardware, this is no surprise.   What is surprising is how many of them are rapidly moving toward virtualization sprawl without addressing how they are going to manage the growth and how they are going to ensure performance and availability service levels to the business.   We have been doing implementation of HP/Mercury monitoring/BSM and Microsoft SCOM implementation for years.   It is possible to build a strategy for monitoring that is dynamic and fits within the ROI requirements of a company with proven technologies that enable ITIL ITSM.