The Mt gox coins were never written off but the Satashi coins after this period of time are considered out of circulation permantly. So any return of the OG would be both surprising, no doubt welcomed but very much introduce a giant source of coins back into the market which would not be bullish.
Satoshi is not the only one with a huge stash of coins. I've read somewhere around here that there are a few guys roaming in the wild who have more than 100k bitcoins in the wallets. What if one of them decides to cash out one day? Before the Mt. Gox dude, it was all theory and speculation, but now it is no longer the case. It is a new reality, a reality where one whale crashes the price dozens of percentages in a matter of days. Surely not something to discard or write off in your investment decisions.
I'm going to need a source on who these people are with 100,000 bitcoin under their own control. Somehow they've decided to never use them or employ that capital in a gambling operation or similar just left them unused ?
Without details of who it is I cant exactly decide how probable it is they would sell now and decided not to previously.
You can search the forum or wait until someone points you to the appropriate topic. I remember some dude has been claimed to have like 800k bitcoins, and he is not Satoshi Nakamoto.
Anyway, you can perform a search in Google. Just fill in "biggest Bitcoin wallets owned by individuals" and you will find out everything you wanted to know about who officially ranks the highest among Bitcoin owners. Okay, I carried out the search myself and here's the list of top Bitcoin holders. Ironically, Uncle Sam is listed as one of them, though I'm not sure that he cuts as an individual.