Despite what you may believe, neither conservative republicans, nor moderate Republicans, nor far right radical social conservative christian fundamentalists want to bring back segregated schools. Your argument loses credibility to even suggest such a thing.
Roe v Wade being overturned would not make abortion illegal, it would simply give the control back to states to decide one way or the other, in other words, just what the constitution intended. Yes, it would eventually be made illegal in some states but not in others.....it would still be available to everybody, some might just have to drive a little to get there, yes not ideal for those that want it but not impossible either. And while I understand those on the left are opposed to this, I as someone who was put up for adoption before Roe v Wade was the law, am not. Even so, I highly doubt this will happen.....I always hear it as a big scare tactic from the left but I've never seen any momentum to even start such a campaign.
The issue that you should have seized on, and which I would have agreed with you on, is gay marriage. Kennedy being a moderate was the swing vote when that issue was recently voted on and I can certainly see a push from the GOP to overturn this and I think that would be not only wrong, but also a HUGE mistake that would cost the party at the polls. I admit the system is not perfect.....but if I have to choose between a justice who wrongly votes against gay marriage and a justice who wrongly votes against the 2nd amendment, I'll hold my nose and take the former every day of the week while continuing to fight for a society in which both are upheld.