Plus the event won't end in part 1 considering how big Infinity Wars will be, then it'll be difficult to slot a film in between it w/o actually touching up on that giant event.
Edit: Wait, is the problem that the year is too long or too short?
if the older dudes in here were able to wait three years between empire strikes back and return of the jedi im sure our generation can handle a year between thanos movies
my body ain't ready for this wait, I'm gonna be well past the prime of my life when these movies start rolling out
why did I get old