The thing is short of being responsible for human extinction you never get to choose the future for humankind - only expand or limit their options.
To give an absurd example your descendants may decide for some bizzare reason it would be awesome to keep pet dodos fenced in their yards. Given that dodos are long extinct immediately it is impossible. But if their biotech advanced enough to recover the DNA and clone them and either manually reconstruct or mutate the cloned base until an acceptable genepool was produced operation "yard-dodo" would once again be a possibility - although very remote.
To give an absurd example your descendants may decide for some bizzare reason it would be awesome to keep pet dodos fenced in their yards. Given that dodos are long extinct immediately it is impossible. But if their biotech advanced enough to recover the DNA and clone them and either manually reconstruct or mutate the cloned base until an acceptable genepool was produced operation "yard-dodo" would once again be a possibility - although very remote.