Halo has not been doing copy and paste anything so far. Even most COD's haven't been doing it that much if you actually take the time to play the games and find out.
Compared to what, Fifa ? I am very sorry but Halo and CoD are the most repetitive games I know.
That worked out great with the ps3 and all of its multiplats too.
First of all, let's take a notorious case of a bad port: Bayonetta, which ended up selling more on the PS3. So we can't draw anything conclusive here. 360 being dev friendly meant you got some random games like Bayonetta and Skyrim having a clear advantage but most games had a difference of a 3% screan tear or 4 fps at some level or some texture. That was stuff practically unnoticable to the gamer and it was sometimes in favor of the 360 and some in favor of the PS3. This gen has none of that ambiguity. This gen has raw power.
Dev friendly != raw power.
Are the so called casual still that interested in console gaming? I mean look at the wii since 2011
If you ask me when it comes to casuals, we are grossly underestimating tablets and smartphones.