I did not mean to imply that I had the expertise to undertake this particular teardown, I was just talking in general terms. I have taken somethings apart and been able to repair simple items. Eight track tapes, minnow bucket areators and a flash attachment for my 35mm camera. They were already "Throw-away" if I could not fix them. I would never attempt the teardown in this video, but might be willing to take the cover off and look at stuff if it was screwed on rather than glued.
I have never been able to clean all residue off the surfaces to get the proper seal. Also since it is an electronic device is it not the case that things could become overheated and then malfuction. If there are mechanical fasteners, even rivets, I am much more likely to attempt tear down and repair. But, welds, glue, crimp and seal have rarely worked well for me when I attempt to open and reseal.
I suspect it ends up in somebody's lab facility so some engineer can figure out what parts can be altered slightly, copied and stolen for a competitors product. That is what passes for research in many instances today.
As soon as I see Hot Glue being an integral part of the assembly, I decide against reassembly.
I think it's obvious - Apple wants/needs to spread the Lightning connector across their product line as quickly as possible, otherwise it remains something of a "quirk" on the iPhone 5 and iPad mini vs the enormous installed base of the larger dock connector.
Personally at this time I'd still go for the iPad4 as the CPU change is IMO not worth dealing with the connector incompatibility (also have an iPhone 4 and a 4S).