Selling online opens a whole new category of customers to places. There are people who like to buy things from home because they don't have the time to go to the store. There are people who don't have certain stores in their area and would shop online if they could. I think it's a great idea.
At this point, RadioShack has become more of a service center and all they do is carry parts. It's pretty much essential if your looking for TV adapters and laptop projectors. Aside from carrying a few major brand-names, RadioShack isn't a tech giant and, like others have mentioned, it's going to take more than online advertising to save them.
Radio Shack is the prime example of a company that has fallen behind the times. They failed to keep track of products trends and the desires of their customer base. Their store don't carry any first rate products and have dated physical appearances. They won't be saved by bankruptcy, the assets of the company will end up being sold to another retailer, such as Best Buy.
Radioshack has not kept up with the times and is now pretty irrelevant. The products that are sold at RadioShack are available at many other retailers, both online and at brick and mortar locations, for less. Having a larger presence online will not save them because customers don't even think of Radioshack as a good place to shop and the name is misleading.
Radio Shack, a long time retailer of electronic goods that specialized in gear for repairs and servicing of radios, TVs and electronic devices has seen its market share suffer in recent years. With the change in the production of electronics, much of Radio Shack's inventory has become obsolete and no amount of online presence or advertising will bring this once popular chain back to financial viability.