  Black holes are inevitable mathematical outcome of spacetime-energy coupling
in general relativity. Currently these objects are of vital importance for
understanding numerous phenomena in astrophysics and cosmology.
  However, neither theory nor observations have been capable of unequivocally
prove the existence of black holes or granting us an insight of what their
internal structures could look like, therefore leaving researchers to speculate
about their nature.
  In this paper the reliability of supermassive Bose-Einstein condensates
(henceforth SMBECs) as alternative to supermassive black holes is examined.
Such condensates are found to suffer of a causality problem that terminates
their cosmological growth toward acquiring masses typical for quasars and
triggers their self-collapse into supermassive black holes (SMBHs).
  It is argued that a SMBEC-core most likely would be subject to an extensive
deceleration of its rotational frequency as well as to vortex-dissipation
induced by the magnetic fields that thread the crust, hence diminishing the
superfluidity of the core. Given that rotating superfluids between two
concentric spheres have been verified to be dynamically unstable to non
axi-symmetric perturbations, we conclude that the remnant energy stored in the
core would be sufficiently large to turn the flow turbulent and dissipative and
subsequently lead to core collapse bosonova.
  The feasibility of a conversion mechanism of normal matter into bosonic
condensates under normal astrophysical conditions is discussed as well.
  We finally conclude that in lack of a profound theory for quantum gravity,
BHs should continue to be the favorite proposal for BH candidates.
