In the times leading up to the destruction of the Bais Hamikdosh, may it be rebuilt soon, there was a Sanhedrin and there could be one official policy of the Chachomim. Unfortunately that is no longer the case and there are very few issues for which there is unanimity among Talmidei Chachomim.
Sam2,
I think you know very well that it is the pashtus of the Gemara in many places (e.g. Rav Tanna u’paleg) that Amoraim cannot argue on Tannaim in Halacha matters unless they have a Tanna to rely on.