“Thin Clients” to replace the “PC” ?

We all know that the “Thin Client” and Citrix” technology certainly offers many benefits to an enterprise in terms of TCO from initial cash outlay to support. However, can that technology fully support the enterprise today? While it is true that those costs are reduced, what happens to that cost when you factor in server outages, carrier problems, etc. You are pretty much dead in the water. What do you think?