If the history of PC OEMs are any indication there will probably be a lot of diversity in the Android phone/tablet market at first but over time some major players will be established and there won't be much room left for anyone else. Chinese manufacturers are still at a big disadvantage when it comes to supporting their products and getting them into the retail chain around the world. I think it's likely they will take the familiar role of manufacturing the devices for companies who can handle the nuts & bolts of advertising, selling and supporting it.