It could well be more and more simplified but gore is non-simplicity dependent - as in it is appreciated irrespective of simplicity.
As for the kids part, irrelevant in that the game is rated by censors and not Activision, and they have never managed below 16 years on any COD.
There may be a point for cleaning it up for the 16-18 year olds, but that point is lost on me.
Treyarch said the last time in BO1 they couldn't include gore in MP because the consoles lacked enough RAM to handle both it and customization, so they made a choice and kept customization only. I don't agree but that's fair enough. Ok so for BO2, if they can't include gore in the console versions, put it in the PC version then, which can support much more RAM for both customization and gore. How about it Treyarch you f'ing vaginas, are you gonna answer us?