I would agree Tony. The current law allows for the superstations throuh 2009----which is the analog cut off date now. But SHVERA also describes copyright payments for digital signals from the supers. I don't think that they intended to cut them off and the common date is largely coincidence.
BTW the poster in the other forum points is maintaining that that the superstations will be considered different entities when they cease analog broadcasting. I am not entirely clear on how he gets there but it might be true.
It is all unclear to me. I don't know if the -DT designation will survive the analog cutoff, or how it will all be treated. But I guess that wew ill see eventiually.