Larry,
If there are no buyers at 0.0001, or there is a halt in trading, yes, then your stock is worth "0".
Otherwise, it can only be worth less than 0.0001 if they do a reverse split, giving you less shares at a higher price per share...then, if those shares go down, your original investment goes lower than 0.0001...
Sincere Cheers, Welcome, &GLTU
GetSum