If Satoshi is dead, he will become a symbol or even a legend with time
But he is likely already a legend, and even more so if no one finds out about him. Though this is unlikely, there should be folks who know for certain who is the guy behind this name, and they will make a clean breast sooner or later (when their time comes). Regarding the questions in the OP, Bitcoin technology is not tied to just one person (in other words, there's no single point of failure), so everything will go on as per usual. The market sentiment can be confused, though. On the one hand, his coins would be essentially left for dead, which would mean the fears of them being dumped will vanish over time (provided there were any, in the first place, of course), while on the other, the markets may feel somewhat depressed and some folks may choose to dump their coins (but not many, anyway). The community won't be quite happy, obviously. I guess the majorly would choose if Satoshi remained incognito till the end of days (or at least, till the end of Bitcoin)
Are you lot stupid?
Ever heard of Wills, inheritance, etc?
Satoshi would have left it to his children and they will start selling to buy flashy homes and cars. The children may not realised their dad invented Bitcoin. They will come on here and see the ungrateful fuckwits making negatives comments and go "fuck you you ungrateful twats" and dump 5000 BTC per week.
Now that would be fun

You have a few questions to answer before your post can make some sense. First, you should prove that Satoshi is a real person, dead or alive, and not some group of researchers (or an obscure government agency like the NSA). Further, if he is (was) a real human, you should then prove then he has (had) children at all. Besides that, the next thing you would have to prove is whether he actually went for "wills, inheritance, etc" as you innocently assume. Just in case, I myself don't have to prove anything since I didn't challenge or question anything in my post
Don't know about stupid, but your comment looks more like a remark made by a clown