Glycolysis question! What would happen if we failed to ferment pyruvate under anaerobic conditions?

Glycolysis would stop.
In order for a reaction to occur, all the reactants must be present.  In order for glycolysis to occur, NAD must be present in order to accept the high energy electrons.  If so much glycolysis occurs that all the NAD is oxidized to NADH, glycolysis could no longer occur.  Since the purpose of glycolysis is to produce energy in the form of ATP, no more ATP would be produced.  Things like your muscles (which use ATP in order to contract) would stop working.  
Lactic acid fermentation changes the pyruvate to lactic acid, but it also reduces the NADH back to NAD.  Thus fermentation, in regenerating the NAD, allows glycolysis to continue.

no such a condition or metabolic disorder have been reported.
ferementation of pyruvate leads to formation of lactic acid that is not important for body.in addition the major role of pyrovate is to provide TCA cycle precursors.
so nothing will happen but incrase in rate of TCA cycle while hypoxy