I agree with your point that as the technology exponentials grow the power of simulations and computer added testing will be very close to reality. But in my opinion animal testing, even in the future, you speak of will still exist. It does not matter how close one gets to realistic result, the computer can be 99.9% accurate but it is still not 100% or reality. Yes, the volume of testing will decrease but the final test right before human testing will always have an animal or maybe specially engineered testing organism. Scientifically, we would not have to test on the organism. However, as humans, we want assurance even at the cost of others.