I don't think so. Maybe I'm reading between the lines but I think Kennedy is a vote to uphold bans on late term abortions. Remeber, the wall has to be taken down a brick at a time. It will be tedious and tendentious but worth it. Of course this first case is only about one procedure but he is definitely a vote to uphold a ban on the procedure.
Kennedy put some markers in that dissent (maybe for purposes of arguement, but they are there). He would have to abandon those markers to vote to ban all late term abortions involving non-viable fetuses, except where the physical health of the mother is seriously at risk.