Personally in my biased opinion, I'd like to see the orders receive their own lands- even if a small plot. However, this doesn't have to be server dictated- for example, the orders could all play politics and gain land within a pre-existing nation.
However, I do agree with Jack's point- the orders (in most cases) don't hang around together in a city and roleplay, because the majority of our RP comes from interactions with spooks. We don't get that inside our respective keeps- we get that from going outside. At least in the Paladin's case, the base/region has always acted more as a staging ground for crusades, place to train students one-on-one, and a place to keep our connection pool (chancery).
My last point relates back to the first, though- we don't "require" staff granted regions to exist. The politics of getting land within a nation is very plausible, as is our applying for a guild charter once 6.0 is actually launched.
What is NOT plausible at the moment, though, is likely a collective of the three main orders. Farryn and Jallentime pretty accurately described the political scene- we aren't very willing to work with each other at the moment. I agree with Farryn that we should let RP fall as it may, and if we're granted land then great.