I don't know about the Saga team, but I can certainly tell you how I'd react if you suggested this kind of thing to the Standoff team. More specifically, I have a knee-jerk "fuck off and die" reaction to such requests. Why? Because in the past, I've heard such suggestions aimed at Unknown Enemy and Standoff a few times - that we should work together with some other project, because why re-invent the wheel? The trouble was that in each case, the suggestion was put forward by a member of that project, and in each case, the projects in question were poorly managed and poorly thought-out. So, in my mind, the suggestion to get together to stop re-inventing the wheel is inevitably associated with a lousy project trying to turn itself around by destroying a succesful project and taking its staff.
That's just me, of course. Saga's view on such proposals might be different - but I doubt it. We all work together and help each other out in small ways, but there's simply no point in two projects working together on a closer level. And this is not only because of what I said above, but also what Lars said - the fact is, we all have different goals, and if two project teams were to work too closely together, the result would be that one of the projects would have to sacrifice some of its goals.