I really think it should revert to Loadouts you cannot customise like the ones Halo: Reach had. Halo 4 had its flaws with the loadout system. People complained about the system in Halo 4 which ultimately led to the decrease in population.
Hopefully 343 Industries will bring back the old loadouts but if not, at least slow down the changes to Halo. The change was really a shock in Halo 4's case.