I really dont think you will see that in our lifetime. The proven technology simply isnt there yet.
I have no problem with replay as long as it is not abused. If the games are held up numerous times to review a play then that will not work. If it can be more of an instant thing or only one review is allowed per game then im fine with it.
I think if we learn anything it is that the MLB umpires are awfully darn good.