What would the healthcare landscape in the United States look like if the Supreme Court actually invalidated Obamacare?

A few days after the November election, the Supreme Court will hear California v. Texas. In that case, the plaintiffs contend that Obamacare’s individual mandate, the requirement that people purchase health coverage or pay a penalty, is unconstitutional. They further contend that Congress effectively removed the mandate when it set the penalty to $0 in 2017. Since the mandate was a core part of Obamacare, the entire law is now invalid.