No reason to be so pessimistic about quantum randomness. Quantum theory is barely 100 years old and our understanding of it is still evolving massively. Though the latter is not always appreciated by the public.
Personally I am also not convinced that LHV theories will every describe the effects correctly. But whether the successor of QM ultimately contains true randomness or not, there is no reason to think it will forever stay an 'inexplicable mystery'.
