Knowing what I do about Fog Creek (which includes no specific information on this particular question) I would very much doubt they would ever do that. The support costs for self hosting are just too high to justify the expense. Often these costs come in more than a support tech's time, as certain problems require code base changes to fix.

Do you have some sort of governmental regulation that keeps you from using hosted products?

Even secrecy-minded orgs like the CIA are moving apps to these platforms. Typically a regulation won't say "no cloud", but e.g. FISMA would require an online infrastructure to pass certain third-party assessments.

Does your org use Salesforce? (not being obtuse, just trying to figure out if your organization really doesn't use any cloud products, or if there are certain exceptions).

It's fairly common in large organizations, even progressive internet-focused ones, to have a rule of "no sensitive/confidential data on third-party systems that haven't been through a security audit."

Unfortunately, some less-progressive companies leave off the last bit and just ban everything.