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Desktops in the cloud are great!

... Except when the network is down. Then nobody can do anywork at all.
... or when the cloud provider suddenly goes belly up, leaving you stranded.
... or when the cloud gets hacked, and all your corporate secrets get stolen
... or when a government secretly requests those same secrets for the benefit of its corporations
... or when the cloud provider sells or uses for its own benefit those corporate secrets
... or when the provider suddenly changes the infrastructure, leaving you with a product that no longer suits your need
... or when existing infrastructure didn't meet all existing requirements to begin with, forcing you to kludge together some sort of workaround
... or when the provider increases the price year by year until the savings that going to the cloud initially brought you have vanished.

Yeah, but aside from all that, desktop clouds are great!