It's not nearly as vague as "there are reasons to believe" that the Court "might come for birth control next". Justice Thomas said it very very clearly in his opinion today:

"For that reason, in future cases, we should reconsider all of this Court’s substantive due process precedents, including Griswold [contraception], Lawrence [sodomy], and Obergefell [same sex marriage]. Because any substantive due process decision is “demonstrably erroneous,” we have a duty to “correct the error” established in those precedents."

They ARE COMING for it next. They just said so.