streaming anything has an effect on bandwidth, not to mention the system resources being used. unless it's actually localized to the system and sync'd in some manner and not specifically broadcast. if you could program the applet to be controlled by a specific cpu core that isn't in use, with a very low memory footprint and broadcast at around 56kbps, wouldn't be too bad.
Well I am sure it will be fine if they did it, they currently have an auto-adjusting-graphics system that lowers your settings if you set things too high. As well, they could detect if it suddenly effects your beacon stability (ping) and go from there.