It is definently sad that the show is ending and I will go out on a limb and say there will be no show that will ever touch this show on so many levels. What I will plan to do to keep the show alive is to rewatch the episodes over time. To me this show just never gets old, there is always something you find in repeat viewings that you missed in previously watching it. I also think after it is over and we have fully digested how things have played out, it will be very interesting to go back and rewatch the entire series from the beginning. I'm sure no matter how it plays out, we will see some subtle clues that we missed in past seasons. One other thing to do to spice up going back and rewatching this masterpiece again is to help someone discover the show who hasn't yet been turned on to it.
A lot of people out there are not HBO suscribers and it could be very rewarding and fun to find a buddy who hasn't been turned on to the show and get them into it. Have them watch it with you from the beginning and you can kind of live vicariously through them as they react to the things you once did the first time you watched an episode. And you can sit back with a smile on your face knowing how everything plays out while they enjoy the ride for the very first time.
Nicely said, WITWF and you have put forward some good ideas. I think I know someone who has never seen the show and who would adore it. It might even be a good chance for me to make some headway with her on the romantic front. Well, you didn't expect purely unselfish motives from a Soprano fan, did you?