i loved spartan ops and having my own characters developing story and seeing his boss armor and actions during cutscenes i loved spartan ops very much and i think it should remain in halo five as it adds to the story it was like halo 4s ODST but much better. And the fact that armor customization comes into role much more in spartan ops then in campaign or firefight i think spartan ops should not be removed. But i do miss firefight and believe if both cannot exist together because of limited time and staff (because we don't won't you guys to rush production to throw in things for us even if they are amazing because it lowers the quality of the game overall and normally has a huge affect on graphics, i would rather have quality over quantity.)then they should incorporate firefight qualities into spartan ops. In order to make spartan ops better i believe some changes should be made.
For example
add waves
multiple objectives
more diverse waves of enemies
maps were the objectives are not in a straight line of sight 100 yds infront of you and enemies on the corners
more of a cooperative necessity
time limit even after obective complete (short survival mode)
option to be the enemy or play the enemies point of view( although this contradicts my earlier statement about quality over quantity... its just something i would like to see)