Honestly I would prefer it to be 1 second but like a 10 second CD, with a 1 second 'channel' where he can still do everything.
Basically he uses it more often, but you can outplay it by holding your abilities for just a second, or by catching him off guard.
Yasuo doesn't need more tools to outplay, people don't like him because his Windwall doesn't have very viable counterplay (basically it's run until it ends... which can be really long).
With the lower duration and channel it needs to be more of a proactive thing so people don't feel like shit when he throws out a W last second and blocks a full combo/ult, so when he Windwalls stuff you actually feel hella outplayed (as he needs to choose the direction he's gonna throw it in a full second before it actually goes off). It'll still be a fairly strong ability, since you could time it to cut off an ADC from a Mage right as you ult or engage on them, with the second being enough to kill squishies if you already hit a Q+R.