Because Orthodoxy is the true way, from the perspective of the Orthodox. The faith they live is the orthodox faith (not orthodox as in communion of Orthodox Churches, but the true meaning of the word orthodox). So why will the Orthodox accept a position that is not orthodox? Its like asking the SSPX to accept Vatican II. From the SSPX point of view, they are traditionalists and Vatican II is anti-tradition. To accept Vatican II is to be non-traditionalist. For the Orthodox to accept teachings apart from what they have been following since the beginning are heterodox, so would be contrary to their very nature.
Truth is non-negotiable.