Guess we'll figure out how to make mice immortal sometime soon, and sadly realize that the drug cocktail doesn't work on humans. Then the meek mice take over the earth as humanity dies off...
Presumably the mice would still need humans to keep producing the drugs that keep them immortal. But if immortality was a genetic trait passed on to their offspring then we’d be in trouble!
This future is oddly more comforting to me than Skynet.