Not an April Fools joke released a day before April Fools is just...well, it's maybe too much on the nose, if you know what I mean XD That being said, Satoshi as a figure of BTC returning, I don't think it would benefit BTC at all. I think the initial appeal of secrecy of who created BTC still, to some degree holds up today and works for BTC. But also, even if Satoshi came out, I can't see him dumping everything just now, it wouldn't make any sense.
He has a solid share and that's why he really cares about coming back and influencing this poor thing of ours.