“Within ten years - at least a significant minority of physicists will conclude that special relativity theory, as it is presently understood, has to be amended.”

The twin paradox in its familiar form is not the only two or more object time dilation paradox that can be constructed. Familiar attempts at resolving it rely on the ad-hoc introduction of a third principle - and/or, the replacement of Einstein's own first postulate with an alternative one. This method does not resolve all other two or more object time-dilation paradoxes that can be constructed. Therefore, special relativity in its presently accepted form is still incomplete.