Myth
Amendments don’t work. The federal government doesn't follow the Constitution now. Why would they follow an amended Constitution?
Fact
Amendments do work. Presidents don't seek 3rd terms because of the 22nd amendment. Women can vote because of the 19th. We abolished slavery with the 13th and made freed slaves citizens with voting rights using the 14th and 15th. And ask yourself if you would be just well off with the 2nd amendment as without it.
Not an argument against a Convention
It should be noted that this argument isn't in opposition to a convention, but rather to any amendments proposed either way. This is an argument against the entirety of Article V.
It's a self-contradictory argument that says everything is pointless but we must preserve the status quo.
Which Constitution are we talking about?
The average person on the street is completely unaware that the federal government actually does follow the Constitution.
They're just following the wrong one.
They're following the Constitution as interpreted by the Supreme Court. You and I follow the Constitution as written by the founders.