What's the point of a 1,000-year jail sentence?

To drive Wolverine even more mad and crazy.

Generally speaking any sentence above 5 years is ineffective. It is very hard impossible to reintegrate the person after that.

Too bad that there aren't exiles and penal colonies any more. (I am against death sentence, think that life sentence is unbelievably cruel and that rapist and such should be removed from the society permanently)

Its for the future once we become immortal! Law makers are already thinking about it! :-D

It is important in case of an amnesty in future. The duration can be shortened.