Id happily exchange his ability to full clear waves so early to get back his ability to instantly nuke squishies with his E/ult, like he used to be able to. It was always fun utterly annihilating the enemy back line with 2-3 spells like in the good old days. At least now his ability to dumpster people is delayed and has counter play(early/mid, anyway), such that in order to really reach his full potential he needs a good team to work with.
The reason he is so popular in the LCS is more because of his ridiculous damage potential more than his wave clear. Viktor almost always has the most damage to champions by a large margin in games that he's in, as far as ive seen anyway.
But Viktor has always has insane wave clear for as long as I can remember, and even when they nerfed his E damage prior to the mid season mage update, he was still eventually able to full clear a wave with one E, it just took him slightly longer to do it. Again though, this was when all of his damage was up front and he could literally obliterate a squishy target in the blink of an eye.
It is annoying, sure, but I don't think its all that overpowered, and his early game is actually fairly weak compared to some other mid lane mages at the moment.
Cant we all just get along and focus on hating that avian hellspawn Azir instead? [slayer-jinx-wink]