[Hawk66]

Yes, there will be abuse (which you cannot prevent completely) and you have to limit it.

I do not claim that creating such a system will be an easy task but on the other hand I do not think that it will be better just to continue with the current approach also.

This mentioned MIT book give some good advices but it also tells clearly there is no golden bullet and you have to try out things and see what works and what not.