MvM does not prevent amending the Constitution.
(Denny Crane: "Sometimes you can only look for answers from God and failing that... and Fox News".)
No, it doesn't. But MvM should never have been decided the way it was. It was a sheer usurpation of power by John Marshall. The correct response, as I said, should have been a recommendation from the Supreme Court laying out the existence of a Constitutional conflict (or lack of authority), and let the Congress correct the situation via. the amendment process.
An amendment would be pointless since lacking MvM oversight, Congress could do what they wanted regardless of what restraints the Constitution or a new amendment would impose.