Quoting Blair Fraser, reply 3Sales have been increasing so I doubt very much Sins will die anytime soon.
Sales of the game itself or the expansions? I wonder if you guys would get a bunch of sales by lowering the price down to $15 or bundling it with a graphics card.
I did want to ask: Sales increased after the latest patch release? It really helps a lot, but even on an i7 975 I wish for better performance...and that's still the thing which stops me from buying entrenchment and which also prevents me from recommending this game to my friends.
Even if it would require much of a rewrite, I do think that the multithreading should be improved for vanilla sins and it's extensions so that it really does use nowadays multicore processors. Such an update might not give much additional income for sins itself, but it would surely boost sales of any expansions and possible follow-ups, thus it would be an investment that can pay back in the future.
As to the time sins might live: It's really nice, for single player I even do prefer it over Broodwar. Oh, hell...that game is over 10 years old, still has loyal followers and receives updates? See...and sins could do better than that one! The AI already is much better than in most RTS games I've seen, although (naturally) it's still having its weaknesses.