Sorry, the premise is dead wrong. There are two unstated goals in the law: redistribution and paving the way for single payer, which compliments the leftist goal of government control of healthcare.
Improvement of insurance markets is not the goal.
When language in a statute is not ambiguous, there is no need to consider what the intent of the legislation was (as if the Congress truly even considered the intent, none of its members having read it). The language “established by the states” is plain and clear. It certainly was not subject to the “interpretation” Roberts gave it.