Granted, I haven't been playing much. At all.
But consider this: A day once a month when you log on not to the Dome but a specific CP-related location only maybe one or two "frames" big. Like a locked-in diner. Or den of sorts. Or office floor. You'd get a brief description on what you were getting into, then make a new character for that day and not wonder about never finding anybody who was online, because you'd be guaranteed a chance to RP with whomever was there.
Short term benefits would be something like a chance to mix up your characters and start anew, maybe try something fresh. Not to mention a cure for boredom.
Long term benefits would be that maybe new people would be more attracted to these intensive clinics...easier to grasp a scene which can be described in two paragraphs than the whole Sindome world. And maybe if the GMs particularly like one of these disposable characters or scenarios, they could (ask permission and then) encorporate them into the standard SD world.