Hypothetically, if at any point in the Destiny story line, the Fallen offered to help you kick Hive/Cabal/Vex tail, would you accept their help?
Personally I'm not so sure, they seem a little deceitful.
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Well it could work out. 1: trust them, send them on a battle mission to one's territory. 2: when inside, close the doors, let them fight. 3: profit? Although I think when they would come back they would be like 'did you just lock the doors to us?' And I'll be like 'naaahhh... Just some kind of malfunction'.