If they wait so long researching cloud that their whole end-user constituency drains away from them to external IT providers, however, they lose the chance to maintain security and reliability at levels they prefer and justify their salaries for next year.
The cruel truth about the easy-to-use, business-enabled Web 2.0 is that it allows customers – both external and internal – to vote with their feet.
If you can't lock the doors to keep them in, you've got to figure out how to arrange your goodies so they pick most of what they want before getting the chance to walk outside.
Otherwise IT ends up doing hardware support for legacy apps, negotiating and enforcing contracts and precious little else.
In evolutionary terms that might be the way to go; in practical terms it would be a disaster leaving technical decisions to people whose technology vision isn't clear enough to tell the difference between Cloud and fog.