Hmm. I still remember Dunfermline Athletics' astroturfy-pitch being banned a year or so back (after 2 years using it on a UEFA trial), due to complaints over injuries on it.
Me, I'm not sure I see the point. It may be cheaper than 'real' grass, but to me part of the game has and always will be adjusting to different surfaces.
I was playing on a newly-setup rubber crumb surface this afternoon at 5s, and - although it's a different kind of turf to the likely top level - it is a more painful surface to play on if you're wanting to do Proper Football Stuff like diving (in goals, I hasten to add), sliding in, etc. I also think, because you can't really wear studs, it's a hell of a lot slippier and you're a lot more likely to overstretch and pull something.