If Juubi is revived, Tobi will be able to Infinite Tsukuyomi. The only chance of defeating Tobi is to prevent Juubi's revival, or to prevent Tobi from becoming the Juubi Jinchuuriki.
When Juubi is revived , first Tobi has to become its Jinchuriki and then prepare a certain ceremony to make the Jutsu.
Opinions?
Plot-no-Jutsu of course U_U Unless the plot is that Juubi will go rampage on it's ownIt's about 9x stronger than the kyuubi (at full power). Obviously it's strong.