I kind of hate to bring this up, but given that jav gets to keep all the coins that go unclaimed.... well, I'd call that pretty big incentive to shut it down.
I seriously don't see the point of this post. Do you believe that that's why he is shutting down? If he feels that he doesn't have time to run it there is really nothing else to do than what he did. Everyone can get their funds back, he will handle requests manually after the site has been shut down. He also told people to get in touch if they wanted to acquire it.
Well, he could not require everyone to withdraw their funds or they are lost while he looks for a buyer. There's no reason to shut it down and require everyone withdraw their funds.
Yes, you are right - everyone can get their funds back so long as they know who to contact, they contact them within a certain amount of time, etc. What about those who forgot about the handful of BTC they left on instawallet, and stumble across their address 3 months from now? Sure, you could say they deserved to lose it, but that doesn't change the fact that there IS incentive for jav to shut it down.
I hope I am proven wrong, that someone does come along and buy the site (or that jav decides to keep it going until the right buyer comes along). But even if I had the money, it'd be hard for me to cough up the asking price for a site that doesn't have any method of generating revenue.