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Given D7's relatively short turnarounds, would they even shut systems like that down?
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The Airbus FCOM calls for the IRU's to be re-aligned on a crew change. Even if it's just a straight handover, you still re-align the IRU's. Especially given the length of the flight they'd be carrying out.
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What would happen if the ADIRU's were turned off by accident on take off?
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The only way you can turn off the ADIRU's is to physically reach up above the Captain and pull and turn them. So during a take off, that's virtually impossible unless absolutely entirely intentional.
A Captain told me a story about an event that occurred to a 747 operator at Sydney years ago, where the Captain decided to try and re-align the IRS's at the end of the runway just prior to take off to fix a problem. However they were told to line up straight away, which they did, and took off. Not a good result in the end, which required a return to land.
All sorts of things could have possibly happened or gone unserviceable. More likely to have gone unserviceable.
A difference of I think it's greater than 5 degree's between nav displays, will trigger an ECAM.
Mick