My guess is that rectifying the slope would prove to be a big obstacle on top of the cost of installing the pitch. It may be that the savings from being able to use it for u20s, u17s etc, and train on it (as well as income from leasing it out) could recoup that cost. We have a couple of case studies in Dunfermline and Hamilton and others to see if this is the case.
I'm not convinced it will make a significant difference on the playing side though. Hamilton's success isn't due to their pitch, it is down to their players playing well under a manager that has a plan. I also think we've had these pitches around long enough that we can start to understand whether there really is an increase in injuries compared to grass.