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Probably run out of steam?
I think it's more they have absolutely no idea how to continue the story without turning it into a mass effect shitshow, which probably wouldn't bring fans back now that the realization's setting in that halo 4 has like a daily 18k player peak less than a year after launch. It doesn't help that they completely blew their plot load with their first real standalone installments. Halo 4 may not have put a major dent in the story, but Silentium literally tied up a good 95% of any interesting plot lines, pre-established or otherwise. It's mind-boggling because they left practically nothing to expand upon in the future games without introducing more plot-wankery in the first place.
Except
That chapter they released online (which was SO stupid reveals he ISO-Didact survived the rings firing.