Rather than explicitly unsubscribing observers, is building completion into all observables a good idea? (For observables that don't naturally complete; streams of mouse moves, driver events etc)

rx.cs

var done = new Subject<Unit>();

var status = Observable
    .Interval(TimeSpan.FromMilliseconds(450))
    .Select(_ => driver.Status()) // driver keep-alive
    .TakeUntil(done);

// On dispose, window close, etc...
done.CompletedWith(Unit.Value);