The sooner it's introduced the better. A video referee and sin bin would work better and allow the game to move on faster, but we can't carry on having these joke decisions made by referees that are ruining the game.
Over the past couple of weeks, we've had:
1. Alli's dive against Burnley
2. Gray's dive against City
3. Zaha's 5th dive this season, this time against City
4. Non-existent handball against Arsenal for West Brom
5. Soft-penalty against Arsenal followed up by two touch penalty against Forest
6. Joke penalty awarded to Stoke in FA Cup by referee making up for the fact that he ruined the Stoke V Liverpool game
Joke refereeing is ubiquitous and is ruining the game. Diving, the other scourge, is a product of this. Next, we will have teams just playing to win penalties because that's the easiest way to score which is pretty much what Zaha does already.