I asked you for a plausible scenario where 2/3rds of Congress votes to repeal the 2nd amendment. If you can't even envision a plausible scenario,
then you can't make an argument that the 2nd Amendment isn't safe.
And that's before you get to state ratification. Not to mention state constitutions also having their own state-level versions of the 2nd.
Those issue are too complex to guess about or just ass-u-me. I told you never to assume.
But to give you a reply to make you happy being replied to, as Johnny Depp would say in Pirates Of The Caribbean, for the sake of replying, my reply is this ...
With gun ownership getting smaller and smaller, some day I can easily foresee a repeal of the 2nd Amendment, sure.
They repealed the right to drink liquor, wine, and beer once. How stupid was that ?!