This is life now....

Car manufacturers make a new model every like 3 months.
Browsers have a new release every 6 weeks.
Movie sequels every 2yrs(ish)

Games are almost yearly, with Cod being the major one, Assassins Creed i think was every 2yr. Uncharted 2yr.

Trend!

This is a good move on SE. ff8-11 was yearly and imo some of the best.