If nobody is bidding, there's no asks to cause the price to go down. More likely, someone buying all of the stock either a) intends to take it private, at which

If nobody is bidding, there's no asks to cause the price to go down. More likely, someone buying all of the stock either a) intends to take it private, at which point there is no more stock anymore or b) intends to fold it into another company, at which point there is no more stock anymore. (Of course, the valuation would likely go down anyways, because people usually pay a premium to buy all of the stock.)