It doesn't matter what they change, they won't be able to compete. Currys/PC World have survived because they sell large items a large proportion of people still like to see in person before they buy. Maplin sells all the stuff people are happy to buy online. Take the £2 Amazon HDMI cable, for example. It's highly unlikely Amazon is making any profit on these cables, infact, it wouldn't surprise me that after overheads, they lose money. However, unlike Maplin, Amazon is large enough to do loss leaders. They realise that, even though shipping is £2, people would rather spend £20 and get free delivery. Amazon is a monster and trying to compete with them, especially if you're a high street store, is futile.
I use Amazon, fairly frequently too, but it bothers me how much of a monopoly they have. Sure, I could put my money where my mouth is, but Amazon is just too damn convenient.