Just throwing my two bits in as well.
I have also written a prequel for possible use with my mod. It has two stories running together. The MC's story while he was studying abroad and the family's story as they fell into the mess they are in when he returns. It had him losing touch with them more and more as things progress, and as he explored life with the coeds at school. And then the other focus was on Nicole as Bruce gets the offer to go under cover and how she tries to deal with a gang basically invading her home. That was the approach I was personally taking with it. But that is just on a list of possible things I wanted to add to the mod, and still might at some point. But I would definitely like to play a prequel.
But I get completely what others have said in regards to people asking if someone will take over the game. I have been asked to do it myself on a few occasions. I agree/think that what will come out of something like that will likely be a reinterpretation of that game, as we are not Saddog. The mod is the game according the me, even though I try very hard to keep in the spirit of Saddog and the original Tyrant. But it definitely has my own variations on it, not including the complete rewrites I've done as well and not used as it changed it too much for what I was trying to achieve in the mod. So any endings added through other means would be like that as well. That doesn't mean I wouldn't happily play it! I totally would.
I just know that whether it's through something like my mod, or completely new remake or another mod, it will likely be a new vision of the story with that creator's own flavor thrown in, so I'm prepared for that. It's going to be different on some levels, maybe many, some may or may not like it. But I think it would be fun to explore this world some more in some way.
EDIT: It should also be said, the last time I was in communication with Saddog was earlier this year. I posted about it in the mod's thread and in the asset thread. In that communication, Saddog did mention he was very busy still working on the last two updates for the game. Now that was a while ago, but personally, I still have hope that he will come swooping in with those last two updates one of these days and get us across the finish line, or at least where he wanted to get us. I realize there could still be plenty to explore after that. But that is just me and my hope as an original ending(s) would be ideal in my mind. I also understand it's been a long time and so I completely get where we are now. Just a hope!