Sorry, but that's a bit of a weak argument. The controller button layout has little to do with "Halo trying to be more like CoD". A better argument for that may be something like "the Spec Ops or the individual Rank-up System or even the Weapon Drops" those are certainly inspired by what CoD has done so well the past few years but that doesn't make Halo a CoD wanna-be. It is very much its own game with its own unique flavor to the crowded FPS genre.
For example, I like that the Weapon Drops are not based on kill-streaks but rather point-based (assists, vehicle takedowns, etc.) In my opinion this is a huge improvement over the previous kill-streak based Weapon Drop system in previous CoD and it's good to see that both Halo 4 and Black Ops 2 are now using it. This system fosters teamwork and provides for a much better overall enjoyable experience in Multiplayer.
With all that being said, however, the same (albeit, weak) argument can be made for CoD being a "Halo wannabe". There's no denying that a lot of what makes CoD such a great game is inspired by what the Halo franchise has done to the console genre (Party System, Forge/Map builder, etc). One thing I wish BO2 would do that Halo has been doing pretty well is Co-op Campaign It's a lot of fun playing through the storyline on a heightened difficulty level with friends online -- above and beyond what Special Ops has to offer.
Anyway, it's awesome seeing how huge these two titles are and how much they're pushing 10-year old hardware. I'm really looking forward to what's to come!