Some of these ideas are great and some are not, like spartan ops being laggy (meaby that is you), but like bringing back the hornet or falcon is great idea because the banshee kinda feels not like a banshee. Also just a disagreement to your idea about the maps, I like the current maps that 343 released and the classic map pack is a good idea but I can defend them not adding in more classic maps. They want Halo 4 to be their own game and having a lot of maps from other Halo games would make their own maps not respected enough or played enough, this is my idea why they only added in one classic map. I could go on and on and on about your suggestions but hey everybody is entitled to their own opinion.
Also I think that they could release an DLC for firefight to be added in. They could also add in the Flood in firefight too if possible.