Sometime this summer, you'll see some kind of major replay controversy (a blown call that still wasn't overturned, a blown call that wasn't reviewable, the crew neglecting to review a big call late when the manager had already used his challenge, etc), and that will bring this all to the forefront again. Regardless, replay is here to stay. They'll improve on it, they'll build on it, but baseball will forever now have replay. They are doing something to get the call right rather than throwing up their arms and playing the "human error" card, and I'm thrilled about that. I can accept "human error" on balls and strikes, and after seeing Adrian Hernandez call a strike on Lucroy that was about 6 inches inside, that's hard enough for me as it is.