If your company wants to deploy VDI they'll figure out the connectivity requirements soon enough.
You're right, though - any kind of network or server outage has people twiddling their thumbs while you're still paying them. Not ideal.
The main complaints I see about VDI, aside from connectivity issues, is that it "isn't fast enough" to play video and games. Big deal. The majority of corporates are supposed to be working in Office-like apps typing documents, editing spreadsheets or pulling together slideshows - no video requirement there. Big bosses don't want you to access YouTube or whatever other time-wasting video sites you like to inhabit.
The minority of people actually needing physical desktops (for things such as network sniffers and maintenance) won't be on VDI.