IMHO...it was stolen to be used for something big. The people on board will be held captive until they’re no longer a threat. The crew were all in on it and very savvy.
No, I don’t agree that the target was the plane. It’s not hard to get your hands on a plane by conventional means - this attracts way too much attention.
If something big was intended for this aircraft, it would have been done at the time. Now, everyone on earth is looking for a 777, it has “Kick Me” written all over it.
This is either a diversion, or it was someone/something on that plane. Not the plane itself. It’s radioactive, toxic.