As the recent Zamii suicide incident told us, it would be a very ugly sight indeed. And also keep in mind, the Tumblrtots got enraged at a cis female for drawing art of a Steven Universe character, and making that character slightly less in weight. I wouldn't want to imagine how the outrage would multiply to exponential levels if it was a cis white male that decided to "improve" on a piece of SU art the Tumblrtots revere because it depicted a character or characters with proper skin and weight.
My personal favorite thing to see of this would be if someone edited magical girl art to make the characters older, as well as sexualized to Ivy Valentine-levels of scantily clad. But sadly, I don't think Tumblr reveres magical girls to the level of Steven Universe characters at the moment.