saying halo is on the decline doesnt make sense. halo wars is the best selling rts on consoles ever, and odst is a expansion thats going to out sell mgs4 and maybe gears of war.odst should have sold at 20 to 30 dollars new. also halo3 has been in the top 2 xbox activity since its release in 2007.on the decline not even close. halos popularity is on the rise and u will no it when reach sells 14m copies.
Halo MCC will sell 5+ million copies(including digital)
halo 5 will sell 10 million copies(including digital)
x1 will pass ps4 in USA, and UK.







