"why do these large companies even need to bother with buying EDIG out...? All they need to do is wait them out and bleed them dry during the litigation."

There may be some truth to that but how about their retailers? Would they be willing to risk the expense and inconvenience of a law suit? They could stop carrying SNDK's products and look to competing OEMs for their products. Of course, if we got the other OEMs in our sights....... :>)