Football pauses all the time anyway- especially nowadays when people regularly feign injury for precisely the purpose of slowing the game down. If you had harsher penalties for diving, a "challenge" system would hopefully act as a deterrent. e.g. if a greek player feigns injury to stop the game against Argentina, Argentina can challenge, and if it's obvious that's what's happened that player can be sent off. I think it would prevent stoppages. Having said that, you would also have to have sanctions in place to prevent firvolous time wasting usage of challenges.
I mean, IF ONLY football lived through its speed and free flowing games... not on the evidence of this world cup, sadly!
I don't see why a video replay is such an extravagantly rich-people-only innovation. I mean, it pales into insignificance when you compare it to already-existing advantages like training facilities and money to put into players and coaches. Plus, Africans and Brazillians (those in the international sides at least) all play in rich leagues anyway. PLUS, even the ones that don't- this isn't exactly a hard concept to grasp that will leave them flopundering in dumbfounded noncomprehension. Just say- you're at the world cup now, so you have the right to do xyz in a match should you choose.