In this Letter we investigate the basic assumptions of the decaying dark matter ( DDM ) theory in the light of recent advances in observational and theoretical cosmology and physics , i.e .
detection of massive astrophysical compact halo objects ( MACHOs ) and Super-Kamiokande results .
Specifically , the consequences pertaining to the shape of the Milky Way galaxy dark halo are discussed .
We find that , by taking into account the values of the main constituent of the mass in DDM theory , massive neutrino , with the mass of 30 eV , and lifetime \sim 10 ^ { 23 } s , the initially proposed value of extreme halo flattening q \sim 0.2 is no longer necessary , and that one can easily accommodate a much larger value of q \sim 0.6 , that is in accord with all available observational data .