Companies already think that switching to a Mac OS from Microsoft wouldn't be worth the hassle. A large company with thousands of PCs has a huge number of applications that require Windows, so they wouldn't even think of migrating. That puts them in a very non-Apple frame of mind.
Companies experimenting with requiring users to purchase their own PCs should expect more Macs to enter their environments.
Do I have tools to get something this large onto my PCs without administrator intervention?