It wouldn't be that hard to dynamically load the info from the server that masterplan currently caches locally. It would slow things up slightly, but still make the program workable and within the limits of WotC's ToU.
We will have to see what happens. Ever since Apple successfully had the court agree that copying includes RAM, it is anyones guess at this point.
I never used any of the export features, but if there are issues with sharing the data, it is the users problem.
Just like I could share my DDI stuff with anyone I want (and people DO, just check for a torrent).
We shall see how this plays out. My bet is that the next Adventure Tool is a Campaign or Encounter Builder that has smiliar features.