I have to say I don't mind if they don't have the funeral, it's not the funeral in itself that's important to the story, it's the moment (during the funeral) that Harry decides what must be done, that he must carry Dumbledore's orders through whatever the cost and he must do it (virtually) alone.
As long as they get that moment of resolve across on-screen I don't care what they do with the funeral, lets face it the scene would be a logisitical nightmare for a director, the final battle of Hogwarts is going to be hard enough!