> How does Congress expect to pass legislation like this when there is a 6-3 conservative judge majority who will almost certainly defend maximalist interpretations of the 2nd amendment?

(1) The Supreme Court has no role in whether legislation passes.

(2) “A member of Congress, as sole sponsor with no cosponsors, introduces a bill” isn't evidence that Congress, as a whole, thinks anything positive about the subject matter, political prospects, or, were it to pass, post-adoption legal prospects of the bill.