Maybe... *shudders* Viktor is right
Maybe humans do need to be upgraded to the next level. A level devoid of feelings and emotions to cloud our decisions and judgement. Viktor never said anything (as far as I am aware of) about how painful it was for him to evolve into the Machine Herald, but, looking at Zaunite standards, it probably takes some bravery to do it. As an individual who isn't particularly fond of mankind's deeds over the centuries, however, I completely understand the possibility of being wrong here.
In his early years, Viktor was actually a devoted scientist who sought to improve society. His faith in humanity, however, was shattered when some jerk named Stanwick stole the credit for the most important creation of his career: Blitzcrank. Not only that, but he then once again stole Viktor's research materials to revive Urgot, once again claiming fame that wasn't meant to be his. Whether thanks to corruption or cowardice, or even laziness, the authorities refused to do anything about Stanwick, and Viktor's despair spiralled downwards hopelessly, throwing him into a problematic depression. By this point, most of his faith in us was gone. He felt envy of Stanwick's success (which should be his), he felt disgusted by whichever was the flaw keeping the authorities from dealing with the thief, he felt powerless and depressed.
So he dropped out of the College where he worked, locking himself in his own private laboratory, at least what was left of his shards, for (probably) a very long time. He didn't speak with anyone during those months/years, and remember, his last memory from the other people was his creation getting stolen without anyone really caring about it. Now whether he came up with the Glorious Evolution out of insanity created by solitude, or brightness originated by that same thing, I don't know, but when he did get out of the lab once again, he had a clear objective: to evolve all humans.
Now I must ask: selfish reasons aside, what are the downsides of Viktor's Evolution? Selfish reasons are ones such as how painful it would be or how ugly we would look. Just to add emphasis to this thought: Viktor is currently the only individual that isn't allied to the Void to have some of its creatures in his faction. Gives us something to think about, since those guys usually only care about eating, but maybe the Glorious Evolution fits more than just humans, to the point that even Voidlings embrace its ideals.
"Whatever is the reason of our existence, we might fulfill it with utmost efficiency."