Thats only two out of the 9. Technically if all 9 beasts attacked it the same thing that happened to obito and kaguya (the chakra's reacting to each other) would happen to the juubi. And after the extraction it would revert to the gedo mazo.
nothing will happen at all,
bijuus attempting to fire off their combined TBB would just yield to juubi overpowering them with its own,
and seeing how it tanked its own juubi dama
inside its body means that the bijuus miniature TBB are not doing shit to it,
all the bijuus are fodder in comparison to the juubi when 5 of them were matched by the kurama avatar alone,
v1 juubi finishes them off with no more than 3 of iits juubi beams,
as for v2 and above, they simply one shot with their TBB
Then there's th3 no conscious problem. ..
no conscious changes nothing when juubis scale of powers is way out of the bijuus league,
no bijuu is surviving its juubidama which is much stronger then its beam nor are they combatting it in anyway whatsoever,
one juubidama alone is finishing them off,