No, it's gotta' stay!
I'm honestly just keeping it there because I don't want to risk leaving residue or part of the sticker, if it won't come off properly. I also just can't be bothered since it's causing no harm.
At least I'm not like my friend, who leaves the plastic around his TVs and monitors so they'll stay pristine. I'd be too worried -- surely unnecessarily -- about overheating.
It's designed to be peeled off immediately, so there's barely any residue. Would probably be "stickier" the longer you leave it though. Pretty ridiculous to buy a white console that looks as nice as the Xbox S and then leave the black warning sticker on it.