No it's not, most times it's pretty conclusive in replays.
It would only be applied automatically to major decisions (offside goals, penalties), which are few and far between. Throw in a couple of video challenges allowed per team, and you'd have just a few stoppages per match, which would be decided in seconds by a 4th official in a studio. Negligible time spent compared to free kicks, throw ins, and prima donnas rolling around on the ground.
Time for the dinosaurs to admit that video technology is needed in our game.