Gone? Probably not. In the possession of someone who will not give them to you? Probably.

To me they are gone

That's true, but you asked a group of pedantic programmers.

What do you think the trustee is going to do? Give all the remaining BTC to himself?

Right after he invents the quantum computer.

Gone sounds so permanent, they're somewhere, will you be getting them back? Probably not. At most you might get ((sum of MtGox assets sold at liquidation prices) - (amount owed to non users, past due bills, etc))/(number of bitcoins they owe their users) * 20. Read: Not much

You gave control of "digital cash" to a fly by night internet company. What were you expecting to happen?