It occurs to me that the Isla Nublar park could've been saved, provided InGen acted quickly enough and got a team to the island before the power went out (again) and before the jungle overtook everything. I think the movie actually overstates how bad the situation was. Lex got pretty much everything up and running again, and the only immediate threats at that point were the three raptors, all of whom are dealt with quite decisively at the end, leaving just Rexy. And anyone firing a tranquilizer gun can take her down (as proven twice with the male rex in the second film). After that, all that's left to do is wrangle the remaining dinos, do a ton of fence repair, and take things from there.
As for "life, uh, finding a way," InGen would need to simply find out out how the all-female population was able to breed, fix that issue by either making them all male (as it's harder to turn from male to female in nature than the other way around), or simply use a DNA from an animal that cannot change its gender, and you're good to go. This would of course necessitate the killing or sterilization of the original population, an ugly but necessary step, and one I can definitely see them taking (after voting Hammond out, of course).
Hammond chose not to do this, though, effectively leaving a multi-billion dollar gold mine behind and turning it into an embarrassing write-off for InGen. The park didn't fail so much as get partially restored to working order and then abandoned by its owner who was going through a moral crisis.