I don't see why it would... if anything it'd cause people to panic because he supposedly holds so many bitcoins.

Regardless, as many say now a days, bitcoin is in control of itself now. We have a vibrant community that is constantly at work and bitcoin now more resembles a fire that can't be put out more than a network that can be controlled by a single entity.

Satoshi is a novelty, we all want to know his identity yet it doesn't actually matter. He's the Kim Kardashian of the bitcoin world, relevant yet not actually relevant haha. Satoshi's opinion would be important but it wouldn't be held to the same as it was in pre-2011. We all want to know who he is, but his appearance probably wouldn't effect the bitcoin network as many people would expect.

He left for a reason, and his project is going strong without him which was exactly what he desired.