The upside to this is that it gives you a second chance to try to make you missions a second time, now that you've had more practice.
The downside to this, is that people have put several days of love and care into their first missions already, only to have them annihilated.
If most of the mission could be saved as a project and carried over, I'd be a much happier camper, personally.
I've recreated two of my missions from closed beta.
One of them, that I'm working on now, is being revamped and expanded. Before, you merely needed to convince a Vulcan Separatist leader of your good intentions. Now, you also get to conduct peace talks (with alternating dialogue pop-ups) in a Vulcan ship in orbit carrying a Federation Ambassador.
The one thing I could hope for but not expect(since it requires someone to basically reformat the dbase info into a readable form, would be to have a way to at least export to a txt file the 'guts' of our missions. that way if we need/want to, we can just copy paste the coordinates for the items and such back into the editor. Of course, this is assuming that more nifty toys dont become availible in the interum that make me want to use other things instead.