Or, with Kelo as an example, everyone would then have no protection against infringement from state and local governments.
It is misleading to say that everyone would "then" have no protection against such infringments on the RKBA. There is no federal protection against state and local infringments "now". You already conceded that a SCOTUS decision saying that the RKBA was NOT an individual right wouldn't affect state laws - Post #607