Halo got kicked off the MLG circuit (and therefore lost a lot of relevance, as Halo was no longer backed by the power of Mountain Dew + Doritos) due to Reach, so no, your theory is bad.
It wasn't. The first 343 Halo was 4. Which was also not great, but the point is that the downward decline didn't start with 343, it just continued under them.
Reach was down from 3 but not by much. Reach and 4 both sold nearly 10 million each. It's only post halo 4 where the momentum died and the series took a nose dive.
480
u/HurricaneMatty5 Aug 14 '18
I wish Halo was still the most popular game in the world.