Nobody can tell how scarce source points will be in the final version. During one of the patches they removed most of the source sources without any replacements, so they are probably more scarce than they will be.
But at the current state the general idea about source it, that nobody really likes how it works now.
Like here:
http://larian.com/forums/ubbthreads.php?ubb=showflat&Number=600856#Post600856
