ppl ban him because they saw what he does when he gets fed (walking into enemy base scoring a triple and walking out with half of his hp, i did it once)
now if he will realy get weaker :
his winrate will drop meaning less picked
his banrate will drop but ppl wont pick him due to weaknness (yasuo is in a very tight spot already when his kit os overloaded, riot didnt decide where do they want to send him so they made him insane all around)
riot will be proud of themselves because they just sent another champ to the bottom of the hell
ofc it will take time for ppl to notice but i think that yasuo will get literaly rekt
his early game on mid was already risky due to lack of actual escape, so now any jungler will just eat him, which means less items for him, less dmg, less plays, and no yasuos
ill still hold my love for him (bought a skin and cant play him cause perma banned *:(