Regarding the abundance of kryptonian survivors or their descents like the phaelosians: Superman and the members of the house of El do not need to be just another bunch of kryptonians, kal in particular could be “The Kryptonian” thanks to an ancestral connection to the god Rao, remember the krypyonian flamebird (thara ak-var) and nightwing (chris kent) from Geoff’s run? They had great imagery and were a nice variation on the theme, they had some fun adventure and felt actually new without breaking the mold.
Not all descent of krypton need to use their powers the same way or with the same degree of attitude, some could focus on the psionic side with tactile tk and greater intellect, others could be better at energy manipulation and projection. The Els should just be at the very top in all categories, the peak of kryptonian potential blessed by rao itself.
There still space for kryptonian technologists, sorcerers, psionicists etc.