The people being acquired may be less willing to be acquired...

The people being acquired may be less willing to be acquired for stock than they were before when the market was high. The depressed stock prices cuts both ways. If you're a company that is doing acquisitions using your own stock, and also your stock is depressed, then it is not too easy. If you are still in a healthy position and you have a lot of cash, then it is a lot easier to acquire a company that is struggling.