I didn't downvote you. I asked a quesiton. Albeit a sarcastic question, but that really seems to be the only reason I can think of targeting him in this way.
I personally don't think that reducing the time that he is able to hold on to his empowered Q would do do much to actually put him in place.
Actually, I don't think his zoning pressure is really anywhere near as strong as you do apparently.
For the most part, you KNOW when he has his 3rd Q up because you can see a visual indicator, you can normally tell where and when he is going to toss it out, and it is pretty slow. It may not be 100% dodgeable, but given the complexity required to set it up, the limited range and speed, and the importance it has in regards to his kit (being his ONLY form of knockup needed to perform his ultimate), I think allowing him to hold onto it for a decent amount of time is more than justified.
I will humor you to a degree however, and here is where the compromise comes in.
IF Riot were to decrease the time in which he is allowed to hold on to his 3rd Q by any significant amount, it should absolutely be expected that the skillshot itself would be made more difficult to dodge.
Meaning the range, the width, the projectile speed, .. at least one of these would be increased.