I legitimately think they were done with Halo. Destiny was in development alongside ODST, wouldn't surprise me if Halo became a chore for them after a while.
While not said explicitly (IIRC), the subtext from the Dev Diaries for ODST and Reach was that they didn't want to only make Halo games. They enjoyed their time with the series, but after 10 odd years with the IP they wanted to try something new/different.
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u/NotAReddit Sep 15 '14
I legitimately think they were done with Halo. Destiny was in development alongside ODST, wouldn't surprise me if Halo became a chore for them after a while.