The bandwidth the whole Skype swarm can scale to in a matter of minutes will most certainly exceed what would be possible if you're running everything from a datacenter. Sure, have a few backup machines ready to takeover roles if super peers drop or something else is impacting the network.
IT managers and IT buyers are obviously not the target market for Skype. They just buy that stuff from CISCO.
Skype has invested considerable development resources into making P2P work over NAT, circumventing firewalls, cloaking and encrypting their traffic to evade packet inspection. Even the client itself is heavily obfuscated. The point of this all is of course to not threaten the P2P model that has allowed them to essentially scale unlimited.
Now, you have Microsoft replacing that with the standard centralized infrastructure that scales terribly. Huh.