Yes. Alot. Injuries already interrupt the flow of the game - and one thing Football is good at is flowing (one reason I personally enjoy it).
A good game is non-stop action (which is my only criticism of US sports - I usually get bored waiting for baseball for example :))
Match outcomes are routinely altered by erroneous ref. decisions, decisions which the whole world except the ref. knows are erroneous because we see the 1000FPS close up 30 seconds later. It's become so nonsensical that at the recent Brazil game, the brazilian players after a bad ref. decision to send off Kaka with a red card were begging the ref. to look up on the stadion screen to see the replay which clearly showed nothing happened, but he couldn't be bothered.
This is the point of the game :) bad decisions aren't all that prevalent - you just notice them because people will yell (rightly) about them. Human error is what makes the sport so much fun.
But more importantly stopping for 30s while replays are reviewed just delays the game - a game which is designed to flow. That would kill it for me!