Totally agree with that. And Satoshi selling all his coins would be destructive as well.
But we assume it won’t happen (selling, not moving). But would it be the case for anybody else?
Would this selling pressure be recoverable?
Naturally, being a Bitcoin supporter I would lean to yeah. However, these things can be unpredictable, and it really does depend on what's happening in the world, and everyone's view on Bitcoin. There's just so many possibilities that could happen to benefit or even undermine Bitcoin. But we assume it won’t happen (selling, not moving). But would it be the case for anybody else?
Would this selling pressure be recoverable?
What can be said, the idea behind Bitcoin works, and for me has the most appeal out of any other currency on the market. Will that change in the future, who knows.
Well, I suppose (and hope) that the UTXO set (or basically the "ownership database" in any future form) will be preserved even if there is a completely new technology and this new "system" moves the Bitcoin's UTXO set into it. But that is for another discussion 
Yeah, although lets say that a hard fork did occur to escape this sort of scenario. Those on the old chain wouldn't be able to easily prove they owned the coins on the new chain. At least, I don't think there would be a easy way of doing it. Maybe, but probably beyond my understanding.