No we aren't. There's plenty of technology out there that could allow for most calls to be made electronically in baseball. MLB doesn't even use replay to its full extent.
Yep, MLB is always years behind the trends & thus have only gotten a mere taste of replay since its 2008 debut. But replay did happen in some form even after years & years of people saying it never would. And yes, even if it does take another 15, 50, 100 years, eventually MLB will finally remove the error that are umpires from the game.