They sure won't if no one submits it, now will they? It's at least worth a try, this year, next year and as long as it takes.
How would you go about eliminating the income tax, without going through Congress. The only other route would be for the states to call for a Constitutional Convention, and pass the amendment there. Either way it has go to the state legislatures for final ratification. A Constitutional Convention is fraught with danger. The last time one was called to amend a founding document, they ended up throwing it out and starting over. Or they could repeal some other amendments that most of us would not like to see gone.
But why start with a constitutional amendment, requiring a supermajority? Why not just introduce a bill to abolish the income tax, requiring only a simple majority?
Can you say "political grandstanding"? I knew you could!