Shikaku will get his plan through, but the Juubi isn't going down this easy. At best they will limit its chakra or partially seal it. Maybe Naruto can absorb part of it. But to destroy something that sunk continents with a few kids and the plan of a dead man?
Not even close to realistic. They need to seal the Juubi, not kill it. Naruto is weaker than every living Uchiha except probably Sasuke, so he can't even dream of stopping Madara or Obito.