Since oryx is dead and mostly all hostile hive/taken forces are defeated, could we just get control of the dreadnaught's super weapon and destroy any possible enemy fleets that come our way? I know that we destroyed the the power sources in one of the missions, but I bet we can get those fixed.
If oryx was able to destroy the awoken fleet, I'm sure the vanguard can do the same against a cabal fleet.
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My personal interpretation was that Oryx powered the weapon that wiped out the awoken and that Oryx used the dreadnaught to amplify and channel his power. If that is the case we wouldn't be able to use the dreadnaught.