This got me thinking, mostly semantics though.
With how CIG is putting the game together, won't it always be considered a 'demo' until it's at full release/beta*? CIG is just adding on the bits as it goes. The content that is in will pretty much be staying where it is. The star system that's being put together is part of the actual star system that is on the final map. The modules of Arena Commander and Star Marine are going to stay as additional modules that the players can enter from in game as simulations. The hangar is the only module that exists that has yet to be incorporated.
Not saying you're wrong, but I feel that the word 'demo' loses its meaning a bit if this were the case.
*Note: Alpha is supposed to be feature incomplete while beta is feature complete but having the bugs fixed (and in the current usage, used for publicity with other developers).