Let's not kid ourselves about ideological spending on so-called 'greenness' - how likely is that? - the trend is of course driven by ratcheting energy prices. One of the consequences is the need to reach out and drag as many applications and assets as possible back into the datacentre, where energy use and other attributes can be managed - and where devices are nowhere near as vulnerable to malware and user-induced glitches; we'll leave IT staff-induced issues out of the equation for the moment.
Additionally, virtualisation technology has now moved on from being simply a way of consolidating servers - although for most real-world users as opposed to commentators, this remains a goal yet actually to be achieved.
There's a growing awareness of virtualisation's ability improve an organisation's disaster recovery schemes. Instead of needing an expensive, energy-guzzling second infrastructure humming away, 24 hours a day, it's now possible to institute a standby system consisting a fraction of the original hardware, but loaded up with virtual images of the production datacentre's servers.