Bitcoins would be able to maintain a price if there was an actual economy utilizing them. I have not been impressed by any of the sites selling stuff for bitcoins, most are very unprofessional. There is still much growing to do to have bitcoin be a viable currency.
I don't think there really needs to be an "economy" built around bitcoin for it to continue rising. There are clearly use cases already in place, like how S.MG on MPEx just raised the equivalent of a million dollars in their IPO. Bitcoin can do just fine serving the tech savvy and the financiers of the world.
You just said that bitcoins will rise because *everybody* is going to be using them, and now you are saying they will keep going up if it is just the smart and rich who use them?