While there's a lot of money in football, the vast majority of it is found with the big clubs at the very top of the game. Let's not forget that some smaller clubs are facing winding up orders over debts that could be paid off with a fraction of a top player's weekly wage.
Could a struggling club in, say, England's League Two or the Scottish Second Division afford to install and maintain this technology? There are an increasing number of them in severe financial difficulties and being forced to shell out for this equipment is a cost they really can't cover.
Also, what about semi/non-professional leagues such as the Blue Square Premier and North/South? Do they have to install cameras too? One could perhaps argue that as non-League clubs they don't but what then happens if they progress in a cup? One would think that a competition like the FA Cup would have to use the technology, but would non-league clubs playing at home be exempt?
I think the matter needs to be properly looked at, but there are some big questions that have to be answered on how these things would be properly implemented. Luckily, we can all trust FIFA to handle the matter in the proper fashion.
Oh.