Bungie should definitely include a horde multiplayer mode.
Gears of War had one, it was lots of fun.
CoD has Zombies
ODST had firefight.
Etc.
It could be set on existing maps and/or with some new specific maps with increasing levels of difficulty per wave and/or have a Wall Defence mode where the City is laid siege to and a fire team has to repel the attack.
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Isn't that what "hang here while I open this door" is about?! No more
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It should be on the tower
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I would love that! Loved it in Halo Reach!