I think that we are starting to move away from a focus on the device to a focus on the library. Once Sony rolls out its apps, all of the big bookstores will have applications which work across multiple devices. Tablet, pc, and mac users can patronize multiple bookstores.
Each of the bookstores is trying to get their hold on the client by making it easier for the client to use the single store across the devices, through having things such as on-line copies which synchronize so that they maintain which page you are at across devices, and making it inconvenient (I'm not saying impossible) to side-load books purchased from other stores.
Clients such as us patrons of these forums find it easy to do such things as maintaining our own libraries using calibre. I expect that for the vast majority of clients, they will stay clients of the first on-line bookstore which grabs them. They simply don't want the inconvenience of having to use different applications to access their libraries.
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