But they _are_ willing to trade at those prices. The person who posted the highest bid is willing to buy at that price and the person who posted the lowest ask is willing to sell at that price. Both regardless of the last trade price.
The lack of "crossing" between those two doesn't mean no one is willing to trade.
The context here was the highest bid / lowest ask. The context was not orders deep in the order book. If your order is the best order available in the book, anyone can just take it, and you will not have any time to move your order before a trade is executed.
The lack of "crossing" between those two doesn't mean no one is willing to trade.